diff --git a/go/reg-test/expected/case-c-dsl-indirect-srec-assignments.sh.out b/go/reg-test/expected/case-c-dsl-indirect-srec-assignments.sh.out
index 659ce29d3..1de5aaaf0 100644
--- a/go/reg-test/expected/case-c-dsl-indirect-srec-assignments.sh.out
+++ b/go/reg-test/expected/case-c-dsl-indirect-srec-assignments.sh.out
@@ -1,45 +1,32 @@
 
 mlr put -v $["a"] = $["b"]; $["x"] = 10 * $["y"] ./reg-test/input/abixy
+DSL EXPRESSION:
+$["a"] = $["b"]; $["x"] = 10 * $["y"]
 RAW AST:
+* statement block
+    * assignment "="
+        * indirect field value "$[]"
+            * string literal "a"
+        * indirect field value "$[]"
+            * string literal "b"
+    * assignment "="
+        * indirect field value "$[]"
+            * string literal "x"
+        * operator "*"
+            * int literal "10"
+            * indirect field value "$[]"
+                * string literal "y"
 
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=INDIRECT_SREC_ASSIGNMENT:
-        text="a", type=STRING_LITERAL.
-        text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-            text="b", type=STRING_LITERAL.
-    text="=", type=INDIRECT_SREC_ASSIGNMENT:
-        text="x", type=STRING_LITERAL.
-        text="*", type=OPERATOR:
-            text="10", type=NUMERIC_LITERAL.
-            text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-                text="y", type=STRING_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=INDIRECT_SREC_ASSIGNMENT:
-        text="a", type=STRING_LITERAL.
-        text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-            text="b", type=STRING_LITERAL.
-    text="=", type=INDIRECT_SREC_ASSIGNMENT:
-        text="x", type=STRING_LITERAL.
-        text="*", type=OPERATOR:
-            text="10", type=NUMERIC_LITERAL.
-            text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-                text="y", type=STRING_LITERAL.
-
-a=pan,b=pan,i=1,x=7.268029,y=0.7268028627434533
-a=pan,b=pan,i=2,x=5.221511,y=0.5221511083334797
-a=wye,b=wye,i=3,x=3.383185,y=0.33831852551664776
-a=wye,b=wye,i=4,x=1.341887,y=0.13418874328430463
-a=pan,b=pan,i=5,x=8.636245,y=0.8636244699032729
-a=pan,b=pan,i=6,x=4.932213,y=0.49322128674835697
-a=zee,b=zee,i=7,x=1.878849,y=0.1878849191181694
-a=wye,b=wye,i=8,x=9.761814,y=0.976181385699006
-a=wye,b=wye,i=9,x=7.495508,y=0.7495507603507059
-a=wye,b=wye,i=10,x=9.526184,y=0.9526183602969864
+a=pan,b=pan,i=1,x=7.268028627434533,y=0.7268028627434533
+a=pan,b=pan,i=2,x=5.221511083334796,y=0.5221511083334797
+a=wye,b=wye,i=3,x=3.3831852551664774,y=0.33831852551664776
+a=wye,b=wye,i=4,x=1.3418874328430463,y=0.13418874328430463
+a=pan,b=pan,i=5,x=8.63624469903273,y=0.8636244699032729
+a=pan,b=pan,i=6,x=4.932212867483569,y=0.49322128674835697
+a=zee,b=zee,i=7,x=1.878849191181694,y=0.1878849191181694
+a=wye,b=wye,i=8,x=9.76181385699006,y=0.976181385699006
+a=wye,b=wye,i=9,x=7.495507603507059,y=0.7495507603507059
+a=wye,b=wye,i=10,x=9.526183602969864,y=0.9526183602969864
 
 mlr --from ./reg-test/input/abixy put while (NF < 256) { $["k".string(NF+1)] = "v".string(NF) }
 a=pan,b=pan,i=1,x=0.3467901443380824,y=0.7268028627434533,k6=v5,k7=v6,k8=v7,k9=v8,k10=v9,k11=v10,k12=v11,k13=v12,k14=v13,k15=v14,k16=v15,k17=v16,k18=v17,k19=v18,k20=v19,k21=v20,k22=v21,k23=v22,k24=v23,k25=v24,k26=v25,k27=v26,k28=v27,k29=v28,k30=v29,k31=v30,k32=v31,k33=v32,k34=v33,k35=v34,k36=v35,k37=v36,k38=v37,k39=v38,k40=v39,k41=v40,k42=v41,k43=v42,k44=v43,k45=v44,k46=v45,k47=v46,k48=v47,k49=v48,k50=v49,k51=v50,k52=v51,k53=v52,k54=v53,k55=v54,k56=v55,k57=v56,k58=v57,k59=v58,k60=v59,k61=v60,k62=v61,k63=v62,k64=v63,k65=v64,k66=v65,k67=v66,k68=v67,k69=v68,k70=v69,k71=v70,k72=v71,k73=v72,k74=v73,k75=v74,k76=v75,k77=v76,k78=v77,k79=v78,k80=v79,k81=v80,k82=v81,k83=v82,k84=v83,k85=v84,k86=v85,k87=v86,k88=v87,k89=v88,k90=v89,k91=v90,k92=v91,k93=v92,k94=v93,k95=v94,k96=v95,k97=v96,k98=v97,k99=v98,k100=v99,k101=v100,k102=v101,k103=v102,k104=v103,k105=v104,k106=v105,k107=v106,k108=v107,k109=v108,k110=v109,k111=v110,k112=v111,k113=v112,k114=v113,k115=v114,k116=v115,k117=v116,k118=v117,k119=v118,k120=v119,k121=v120,k122=v121,k123=v122,k124=v123,k125=v124,k126=v125,k127=v126,k128=v127,k129=v128,k130=v129,k131=v130,k132=v131,k133=v132,k134=v133,k135=v134,k136=v135,k137=v136,k138=v137,k139=v138,k140=v139,k141=v140,k142=v141,k143=v142,k144=v143,k145=v144,k146=v145,k147=v146,k148=v147,k149=v148,k150=v149,k151=v150,k152=v151,k153=v152,k154=v153,k155=v154,k156=v155,k157=v156,k158=v157,k159=v158,k160=v159,k161=v160,k162=v161,k163=v162,k164=v163,k165=v164,k166=v165,k167=v166,k168=v167,k169=v168,k170=v169,k171=v170,k172=v171,k173=v172,k174=v173,k175=v174,k176=v175,k177=v176,k178=v177,k179=v178,k180=v179,k181=v180,k182=v181,k183=v182,k184=v183,k185=v184,k186=v185,k187=v186,k188=v187,k189=v188,k190=v189,k191=v190,k192=v191,k193=v192,k194=v193,k195=v194,k196=v195,k197=v196,k198=v197,k199=v198,k200=v199,k201=v200,k202=v201,k203=v202,k204=v203,k205=v204,k206=v205,k207=v206,k208=v207,k209=v208,k210=v209,k211=v210,k212=v211,k213=v212,k214=v213,k215=v214,k216=v215,k217=v216,k218=v217,k219=v218,k220=v219,k221=v220,k222=v221,k223=v222,k224=v223,k225=v224,k226=v225,k227=v226,k228=v227,k229=v228,k230=v229,k231=v230,k232=v231,k233=v232,k234=v233,k235=v234,k236=v235,k237=v236,k238=v237,k239=v238,k240=v239,k241=v240,k242=v241,k243=v242,k244=v243,k245=v244,k246=v245,k247=v246,k248=v247,k249=v248,k250=v249,k251=v250,k252=v251,k253=v252,k254=v253,k255=v254,k256=v255
diff --git a/go/reg-test/expected/case-c-dsl-operator-associativity.sh.out b/go/reg-test/expected/case-c-dsl-operator-associativity.sh.out
index 33471fbd4..f2ce93359 100644
--- a/go/reg-test/expected/case-c-dsl-operator-associativity.sh.out
+++ b/go/reg-test/expected/case-c-dsl-operator-associativity.sh.out
@@ -1,3101 +1,1746 @@
 
 mlr put -v $x = 1 || 2 || 3 /dev/null
+DSL EXPRESSION:
+$x = 1 || 2 || 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="||", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="||", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * operator "||"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 || 2 || 3 /dev/null
+DSL EXPRESSION:
+     1 || 2 || 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="||", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="||", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "||"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ^^ 2 ^^ 3 /dev/null
+DSL EXPRESSION:
+$x = 1 ^^ 2 ^^ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="^^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="^^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^^"
+            * operator "^^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ^^ 2 ^^ 3 /dev/null
+DSL EXPRESSION:
+     1 ^^ 2 ^^ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^^", type=OPERATOR:
-        text="^^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^^", type=OPERATOR:
-        text="^^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^^"
+            * operator "^^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 && 2 && 3 /dev/null
+DSL EXPRESSION:
+$x = 1 && 2 && 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&&", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&&", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "&&"
+            * operator "&&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 && 2 && 3 /dev/null
+DSL EXPRESSION:
+     1 && 2 && 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&&"
+            * operator "&&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  == 2  == 3 /dev/null
+DSL EXPRESSION:
+$x = 1  == 2  == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "=="
+            * operator "=="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  == 2  == 3 /dev/null
+DSL EXPRESSION:
+     1  == 2  == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="==", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="==", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "=="
+            * operator "=="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  != 2  != 3 /dev/null
+DSL EXPRESSION:
+$x = 1  != 2  != 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!=", type=OPERATOR:
-            text="!=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!=", type=OPERATOR:
-            text="!=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "!="
+            * operator "!="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  != 2  != 3 /dev/null
+DSL EXPRESSION:
+     1  != 2  != 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="!=", type=OPERATOR:
-        text="!=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="!=", type=OPERATOR:
-        text="!=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "!="
+            * operator "!="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  =~ 2  =~ 3 /dev/null
+DSL EXPRESSION:
+$x = 1  =~ 2  =~ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="=~", type=OPERATOR:
-            text="=~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="=~", type=OPERATOR:
-            text="=~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "=~"
+            * operator "=~"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  =~ 2  =~ 3 /dev/null
+DSL EXPRESSION:
+     1  =~ 2  =~ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=~", type=OPERATOR:
-        text="=~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=~", type=OPERATOR:
-        text="=~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "=~"
+            * operator "=~"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 !=~ 2 !=~ 3 /dev/null
+DSL EXPRESSION:
+$x = 1 !=~ 2 !=~ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!=~", type=OPERATOR:
-            text="!=~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!=~", type=OPERATOR:
-            text="!=~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "!=~"
+            * operator "!=~"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 !=~ 2 !=~ 3 /dev/null
+DSL EXPRESSION:
+     1 !=~ 2 !=~ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="!=~", type=OPERATOR:
-        text="!=~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="!=~", type=OPERATOR:
-        text="!=~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "!=~"
+            * operator "!=~"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  == 2  != 3 /dev/null
+DSL EXPRESSION:
+$x = 1  == 2  != 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!=", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!=", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "!="
+            * operator "=="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  == 2  != 3 /dev/null
+DSL EXPRESSION:
+     1  == 2  != 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="!=", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="!=", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "!="
+            * operator "=="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  != 2  == 3 /dev/null
+DSL EXPRESSION:
+$x = 1  != 2  == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="!=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="!=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "=="
+            * operator "!="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  != 2  == 3 /dev/null
+DSL EXPRESSION:
+     1  != 2  == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="==", type=OPERATOR:
-        text="!=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="==", type=OPERATOR:
-        text="!=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "=="
+            * operator "!="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  <  2  <  3 /dev/null
+DSL EXPRESSION:
+$x = 1  <  2  <  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<", type=OPERATOR:
-            text="<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<", type=OPERATOR:
-            text="<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<"
+            * operator "<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  <  2  <  3 /dev/null
+DSL EXPRESSION:
+     1  <  2  <  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<", type=OPERATOR:
-        text="<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<", type=OPERATOR:
-        text="<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<"
+            * operator "<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  <= 2  <= 3 /dev/null
+DSL EXPRESSION:
+$x = 1  <= 2  <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="<=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="<=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<="
+            * operator "<="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  <= 2  <= 3 /dev/null
+DSL EXPRESSION:
+     1  <= 2  <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<=", type=OPERATOR:
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<=", type=OPERATOR:
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<="
+            * operator "<="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  >  2  >  3 /dev/null
+DSL EXPRESSION:
+$x = 1  >  2  >  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">", type=OPERATOR:
-            text=">", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">", type=OPERATOR:
-            text=">", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator ">"
+            * operator ">"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  >  2  >  3 /dev/null
+DSL EXPRESSION:
+     1  >  2  >  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text=">", type=OPERATOR:
-        text=">", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text=">", type=OPERATOR:
-        text=">", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator ">"
+            * operator ">"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  >= 2  >= 3 /dev/null
+DSL EXPRESSION:
+$x = 1  >= 2  >= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">=", type=OPERATOR:
-            text=">=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">=", type=OPERATOR:
-            text=">=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator ">="
+            * operator ">="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  >= 2  >= 3 /dev/null
+DSL EXPRESSION:
+     1  >= 2  >= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text=">=", type=OPERATOR:
-        text=">=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text=">=", type=OPERATOR:
-        text=">=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator ">="
+            * operator ">="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  <  2  <= 3 /dev/null
+DSL EXPRESSION:
+$x = 1  <  2  <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<="
+            * operator "<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  <  2  <= 3 /dev/null
+DSL EXPRESSION:
+     1  <  2  <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<=", type=OPERATOR:
-        text="<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<=", type=OPERATOR:
-        text="<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<="
+            * operator "<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  <= 2  <  3 /dev/null
+DSL EXPRESSION:
+$x = 1  <= 2  <  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<", type=OPERATOR:
-            text="<=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<", type=OPERATOR:
-            text="<=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<"
+            * operator "<="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  <= 2  <  3 /dev/null
+DSL EXPRESSION:
+     1  <= 2  <  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<", type=OPERATOR:
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<", type=OPERATOR:
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<"
+            * operator "<="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 |  2 |  3 /dev/null
+DSL EXPRESSION:
+$x = 1 |  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="|", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="|", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "|"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 |  2 |  3 /dev/null
+DSL EXPRESSION:
+     1 |  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "|"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ^  2 ^  3 /dev/null
+DSL EXPRESSION:
+$x = 1 ^  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^"
+            * operator "^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ^  2 ^  3 /dev/null
+DSL EXPRESSION:
+     1 ^  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^", type=OPERATOR:
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^", type=OPERATOR:
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^"
+            * operator "^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 &  2 &  3 /dev/null
+DSL EXPRESSION:
+$x = 1 &  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "&"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 &  2 &  3 /dev/null
+DSL EXPRESSION:
+     1 &  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 |  2 &  3 /dev/null
+DSL EXPRESSION:
+$x = 1 |  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 |  2 &  3 /dev/null
+DSL EXPRESSION:
+     1 |  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 |  2 ^  3 /dev/null
+DSL EXPRESSION:
+$x = 1 |  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="^", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="^", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * int literal "1"
+            * operator "^"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 |  2 ^  3 /dev/null
+DSL EXPRESSION:
+     1 |  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="^", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="^", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * int literal "1"
+            * operator "^"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 ^  2 |  3 /dev/null
+DSL EXPRESSION:
+$x = 1 ^  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ^  2 |  3 /dev/null
+DSL EXPRESSION:
+     1 ^  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ^  2 &  3 /dev/null
+DSL EXPRESSION:
+$x = 1 ^  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 ^  2 &  3 /dev/null
+DSL EXPRESSION:
+     1 ^  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 &  2 |  3 /dev/null
+DSL EXPRESSION:
+$x = 1 &  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 &  2 |  3 /dev/null
+DSL EXPRESSION:
+     1 &  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 &  2 ^  3 /dev/null
+DSL EXPRESSION:
+$x = 1 &  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 &  2 ^  3 /dev/null
+DSL EXPRESSION:
+     1 &  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  << 2  << 3 /dev/null
+DSL EXPRESSION:
+$x = 1  << 2  << 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<<", type=OPERATOR:
-            text="<<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<<", type=OPERATOR:
-            text="<<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<<"
+            * operator "<<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  << 2  << 3 /dev/null
+DSL EXPRESSION:
+     1  << 2  << 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<<", type=OPERATOR:
-        text="<<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<<", type=OPERATOR:
-        text="<<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<<"
+            * operator "<<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  >> 2  >> 3 /dev/null
+DSL EXPRESSION:
+$x = 1  >> 2  >> 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">>", type=OPERATOR:
-            text=">>", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">>", type=OPERATOR:
-            text=">>", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator ">>"
+            * operator ">>"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  >> 2  >> 3 /dev/null
+DSL EXPRESSION:
+     1  >> 2  >> 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text=">>", type=OPERATOR:
-        text=">>", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text=">>", type=OPERATOR:
-        text=">>", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator ">>"
+            * operator ">>"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  << 2  >> 3 /dev/null
+DSL EXPRESSION:
+$x = 1  << 2  >> 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">>", type=OPERATOR:
-            text="<<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=">>", type=OPERATOR:
-            text="<<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator ">>"
+            * operator "<<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  << 2  >> 3 /dev/null
+DSL EXPRESSION:
+     1  << 2  >> 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text=">>", type=OPERATOR:
-        text="<<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text=">>", type=OPERATOR:
-        text="<<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator ">>"
+            * operator "<<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1  >> 2  << 3 /dev/null
+DSL EXPRESSION:
+$x = 1  >> 2  << 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<<", type=OPERATOR:
-            text=">>", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<<", type=OPERATOR:
-            text=">>", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<<"
+            * operator ">>"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1  >> 2  << 3 /dev/null
+DSL EXPRESSION:
+     1  >> 2  << 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<<", type=OPERATOR:
-        text=">>", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<<", type=OPERATOR:
-        text=">>", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<<"
+            * operator ">>"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 + 2 + 3 /dev/null
+DSL EXPRESSION:
+$x = 1 + 2 + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 + 2 + 3 /dev/null
+DSL EXPRESSION:
+     1 + 2 + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 - 2 - 3 /dev/null
+DSL EXPRESSION:
+$x = 1 - 2 - 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "-"
+            * operator "-"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 - 2 - 3 /dev/null
+DSL EXPRESSION:
+     1 - 2 - 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="-", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="-", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "-"
+            * operator "-"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 + 2 - 3 /dev/null
+DSL EXPRESSION:
+$x = 1 + 2 - 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "-"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 + 2 - 3 /dev/null
+DSL EXPRESSION:
+     1 + 2 - 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="-", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="-", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "-"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 - 2 + 3 /dev/null
+DSL EXPRESSION:
+$x = 1 - 2 + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "-"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 - 2 + 3 /dev/null
+DSL EXPRESSION:
+     1 - 2 + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "-"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 . 2 . 3 /dev/null
+DSL EXPRESSION:
+$x = 1 . 2 . 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=".", type=OPERATOR:
-            text=".", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text=".", type=OPERATOR:
-            text=".", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "."
+            * operator "."
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 . 2 . 3 /dev/null
+DSL EXPRESSION:
+     1 . 2 . 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text=".", type=OPERATOR:
-        text=".", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text=".", type=OPERATOR:
-        text=".", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "."
+            * operator "."
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 * 2 * 3 /dev/null
+DSL EXPRESSION:
+$x = 1 * 2 * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 * 2 * 3 /dev/null
+DSL EXPRESSION:
+     1 * 2 * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 / 2 / 3 /dev/null
+DSL EXPRESSION:
+$x = 1 / 2 / 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "/"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 / 2 / 3 /dev/null
+DSL EXPRESSION:
+     1 / 2 / 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="/", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="/", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "/"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 // 2 // 3 /dev/null
+DSL EXPRESSION:
+$x = 1 // 2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "//"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 // 2 // 3 /dev/null
+DSL EXPRESSION:
+     1 // 2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="//", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="//", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "//"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 % 2 % 3 /dev/null
+DSL EXPRESSION:
+$x = 1 % 2 % 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "%"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 % 2 % 3 /dev/null
+DSL EXPRESSION:
+     1 % 2 % 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="%", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="%", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "%"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ** 2 ** 3 /dev/null
+DSL EXPRESSION:
+$x = 1 ** 2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "**"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 ** 2 ** 3 /dev/null
+DSL EXPRESSION:
+     1 ** 2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="**", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="**", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "**"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 *  2 /  3 /dev/null
+DSL EXPRESSION:
+$x = 1 *  2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "/"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 *  2 /  3 /dev/null
+DSL EXPRESSION:
+     1 *  2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="/", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="/", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "/"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 *  2 // 3 /dev/null
+DSL EXPRESSION:
+$x = 1 *  2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "//"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 *  2 // 3 /dev/null
+DSL EXPRESSION:
+     1 *  2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="//", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="//", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "//"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 *  2 %  3 /dev/null
+DSL EXPRESSION:
+$x = 1 *  2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "%"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 *  2 %  3 /dev/null
+DSL EXPRESSION:
+     1 *  2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="%", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="%", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "%"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 *  2 ** 3 /dev/null
+DSL EXPRESSION:
+$x = 1 *  2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 *  2 ** 3 /dev/null
+DSL EXPRESSION:
+     1 *  2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 /  2 *  3 /dev/null
+DSL EXPRESSION:
+$x = 1 /  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 /  2 *  3 /dev/null
+DSL EXPRESSION:
+     1 /  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 /  2 // 3 /dev/null
+DSL EXPRESSION:
+$x = 1 /  2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "//"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 /  2 // 3 /dev/null
+DSL EXPRESSION:
+     1 /  2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="//", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="//", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "//"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 /  2 %  3 /dev/null
+DSL EXPRESSION:
+$x = 1 /  2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="/", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "%"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 /  2 %  3 /dev/null
+DSL EXPRESSION:
+     1 /  2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="%", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="%", type=OPERATOR:
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "%"
+            * operator "/"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 /  2 ** 3 /dev/null
+DSL EXPRESSION:
+$x = 1 /  2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "/"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 /  2 ** 3 /dev/null
+DSL EXPRESSION:
+     1 /  2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="/", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="/", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "/"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 // 2 *  3 /dev/null
+DSL EXPRESSION:
+$x = 1 // 2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 // 2 *  3 /dev/null
+DSL EXPRESSION:
+     1 // 2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 // 2 /  3 /dev/null
+DSL EXPRESSION:
+$x = 1 // 2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "/"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 // 2 /  3 /dev/null
+DSL EXPRESSION:
+     1 // 2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="/", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="/", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "/"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 // 2 %  3 /dev/null
+DSL EXPRESSION:
+$x = 1 // 2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="//", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "%"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 // 2 %  3 /dev/null
+DSL EXPRESSION:
+     1 // 2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="%", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="%", type=OPERATOR:
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "%"
+            * operator "//"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 // 2 ** 3 /dev/null
+DSL EXPRESSION:
+$x = 1 // 2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "//"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 // 2 ** 3 /dev/null
+DSL EXPRESSION:
+     1 // 2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="//", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="//", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "//"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 %  2 *  3 /dev/null
+DSL EXPRESSION:
+$x = 1 %  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 %  2 *  3 /dev/null
+DSL EXPRESSION:
+     1 %  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 %  2 /  3 /dev/null
+DSL EXPRESSION:
+$x = 1 %  2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "/"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 %  2 /  3 /dev/null
+DSL EXPRESSION:
+     1 %  2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="/", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="/", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "/"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 %  2 // 3 /dev/null
+DSL EXPRESSION:
+$x = 1 %  2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="%", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "//"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 %  2 // 3 /dev/null
+DSL EXPRESSION:
+     1 %  2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="//", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="//", type=OPERATOR:
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "//"
+            * operator "%"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 %  2 ** 3 /dev/null
+DSL EXPRESSION:
+$x = 1 %  2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "%"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 %  2 ** 3 /dev/null
+DSL EXPRESSION:
+     1 %  2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="%", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="%", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "%"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 ** 2 *  3 /dev/null
+DSL EXPRESSION:
+$x = 1 ** 2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ** 2 *  3 /dev/null
+DSL EXPRESSION:
+     1 ** 2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ** 2 /  3 /dev/null
+DSL EXPRESSION:
+$x = 1 ** 2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "/"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ** 2 /  3 /dev/null
+DSL EXPRESSION:
+     1 ** 2 /  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="/", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="/", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "/"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ** 2 // 3 /dev/null
+DSL EXPRESSION:
+$x = 1 ** 2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "//"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ** 2 // 3 /dev/null
+DSL EXPRESSION:
+     1 ** 2 // 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="//", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="//", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "//"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ** 2 %  3 /dev/null
+DSL EXPRESSION:
+$x = 1 ** 2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "%"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ** 2 %  3 /dev/null
+DSL EXPRESSION:
+     1 ** 2 %  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="%", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="%", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "%"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = ++1 /dev/null
+DSL EXPRESSION:
+$x = ++1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "+"
+                * int literal "1"
 
 
 mlr filter -v      ++1 /dev/null
+DSL EXPRESSION:
+     ++1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "+"
+                * int literal "1"
 
 
 mlr put -v $x = --1 /dev/null
+DSL EXPRESSION:
+$x = --1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "-"
+            * operator "-"
+                * int literal "1"
 
 
 mlr filter -v      --1 /dev/null
+DSL EXPRESSION:
+     --1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="-", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="-", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "-"
+            * operator "-"
+                * int literal "1"
 
 
 mlr put -v $x = !!1 /dev/null
+DSL EXPRESSION:
+$x = !!1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!", type=OPERATOR:
-            text="!", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="!", type=OPERATOR:
-            text="!", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "!"
+            * operator "!"
+                * int literal "1"
 
 
 mlr filter -v      !!1 /dev/null
+DSL EXPRESSION:
+     !!1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="!", type=OPERATOR:
-        text="!", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="!", type=OPERATOR:
-        text="!", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "!"
+            * operator "!"
+                * int literal "1"
 
 
 mlr put -v $x = ~~1 /dev/null
+DSL EXPRESSION:
+$x = ~~1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="~", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="~", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "~"
+            * operator "~"
+                * int literal "1"
 
 
 mlr filter -v      ~~1 /dev/null
+DSL EXPRESSION:
+     ~~1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="~", type=OPERATOR:
-        text="~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="~", type=OPERATOR:
-        text="~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "~"
+            * operator "~"
+                * int literal "1"
 
 
 mlr put -v $x = 1 ? 2 : 3 /dev/null
+DSL EXPRESSION:
+$x = 1 ? 2 : 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "?:"
+            * int literal "1"
+            * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ? 2 : 3 /dev/null
+DSL EXPRESSION:
+     1 ? 2 : 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="? :", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="? :", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "?:"
+            * int literal "1"
+            * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ? 2 ? 3 : 4 : 5 /dev/null
+DSL EXPRESSION:
+$x = 1 ? 2 ? 3 : 4 : 5
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="? :", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-                text="4", type=NUMERIC_LITERAL.
-            text="5", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="? :", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-                text="4", type=NUMERIC_LITERAL.
-            text="5", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "?:"
+            * int literal "1"
+            * operator "?:"
+                * int literal "2"
+                * int literal "3"
+                * int literal "4"
+            * int literal "5"
 
 
 mlr filter -v      1 ? 2 ? 3 : 4 : 5 /dev/null
+DSL EXPRESSION:
+     1 ? 2 ? 3 : 4 : 5
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="? :", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="? :", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-            text="4", type=NUMERIC_LITERAL.
-        text="5", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="? :", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="? :", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-            text="4", type=NUMERIC_LITERAL.
-        text="5", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "?:"
+            * int literal "1"
+            * operator "?:"
+                * int literal "2"
+                * int literal "3"
+                * int literal "4"
+            * int literal "5"
 
 
 mlr put -v $x = 1 ? 2 : 3 ? 4 : 5 /dev/null
+DSL EXPRESSION:
+$x = 1 ? 2 : 3 ? 4 : 5
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-            text="? :", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
-                text="4", type=NUMERIC_LITERAL.
-                text="5", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-            text="? :", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
-                text="4", type=NUMERIC_LITERAL.
-                text="5", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "?:"
+            * int literal "1"
+            * int literal "2"
+            * operator "?:"
+                * int literal "3"
+                * int literal "4"
+                * int literal "5"
 
 
 mlr filter -v      1 ? 2 : 3 ? 4 : 5 /dev/null
+DSL EXPRESSION:
+     1 ? 2 : 3 ? 4 : 5
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="? :", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="2", type=NUMERIC_LITERAL.
-        text="? :", type=OPERATOR:
-            text="3", type=NUMERIC_LITERAL.
-            text="4", type=NUMERIC_LITERAL.
-            text="5", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="? :", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="2", type=NUMERIC_LITERAL.
-        text="? :", type=OPERATOR:
-            text="3", type=NUMERIC_LITERAL.
-            text="4", type=NUMERIC_LITERAL.
-            text="5", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "?:"
+            * int literal "1"
+            * int literal "2"
+            * operator "?:"
+                * int literal "3"
+                * int literal "4"
+                * int literal "5"
 
 
diff --git a/go/reg-test/expected/case-c-dsl-operator-precedence.sh.out b/go/reg-test/expected/case-c-dsl-operator-precedence.sh.out
index 40a3b5401..0d35a8789 100644
--- a/go/reg-test/expected/case-c-dsl-operator-precedence.sh.out
+++ b/go/reg-test/expected/case-c-dsl-operator-precedence.sh.out
@@ -1,3241 +1,1811 @@
 
 mlr put -v $x = 1 || 2 ^^ 3 /dev/null
+DSL EXPRESSION:
+$x = 1 || 2 ^^ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="^^", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="^^", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * int literal "1"
+            * operator "^^"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 || 2 ^^ 3 /dev/null
+DSL EXPRESSION:
+     1 || 2 ^^ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="^^", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="^^", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * int literal "1"
+            * operator "^^"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 || 2 && 3 /dev/null
+DSL EXPRESSION:
+$x = 1 || 2 && 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * int literal "1"
+            * operator "&&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 || 2 && 3 /dev/null
+DSL EXPRESSION:
+     1 || 2 && 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * int literal "1"
+            * operator "&&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 ^^ 2 || 3 /dev/null
+DSL EXPRESSION:
+$x = 1 ^^ 2 || 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="^^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="^^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * operator "^^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 ^^ 2 || 3 /dev/null
+DSL EXPRESSION:
+     1 ^^ 2 || 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="^^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="^^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "^^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 ^^ 2 && 3 /dev/null
+DSL EXPRESSION:
+$x = 1 ^^ 2 && 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^^"
+            * int literal "1"
+            * operator "&&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      1 ^^ 2 && 3 /dev/null
+DSL EXPRESSION:
+     1 ^^ 2 && 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^^", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^^", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^^"
+            * int literal "1"
+            * operator "&&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = 1 && 2 || 3 /dev/null
+DSL EXPRESSION:
+$x = 1 && 2 || 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * operator "&&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 && 2 || 3 /dev/null
+DSL EXPRESSION:
+     1 && 2 || 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "&&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = 1 && 2 ^^ 3 /dev/null
+DSL EXPRESSION:
+$x = 1 && 2 ^^ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^^"
+            * operator "&&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      1 && 2 ^^ 3 /dev/null
+DSL EXPRESSION:
+     1 && 2 ^^ 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^^", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^^", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^^"
+            * operator "&&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 == 2 <= 3 /dev/null
+DSL EXPRESSION:
+$x =  1 == 2 <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="<=", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="<=", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "=="
+            * int literal "1"
+            * operator "<="
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 == 2 <= 3 /dev/null
+DSL EXPRESSION:
+      1 == 2 <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="==", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="<=", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="==", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="<=", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "=="
+            * int literal "1"
+            * operator "<="
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 <= 2 == 3 /dev/null
+DSL EXPRESSION:
+$x =  1 <= 2 == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="<=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="==", type=OPERATOR:
-            text="<=", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "=="
+            * operator "<="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 <= 2 == 3 /dev/null
+DSL EXPRESSION:
+      1 <= 2 == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="==", type=OPERATOR:
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="==", type=OPERATOR:
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "=="
+            * operator "<="
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 <= 2 |  3 /dev/null
+DSL EXPRESSION:
+$x =  1 <= 2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="|", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="|", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<="
+            * int literal "1"
+            * operator "|"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 <= 2 |  3 /dev/null
+DSL EXPRESSION:
+      1 <= 2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<=", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="|", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<=", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="|", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<="
+            * int literal "1"
+            * operator "|"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 |  2 <= 3 /dev/null
+DSL EXPRESSION:
+$x =  1 |  2 <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="|", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="<=", type=OPERATOR:
-            text="|", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "<="
+            * operator "|"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 |  2 <= 3 /dev/null
+DSL EXPRESSION:
+      1 |  2 <= 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="<=", type=OPERATOR:
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="<=", type=OPERATOR:
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "<="
+            * operator "|"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 |  2 ^  3 /dev/null
+DSL EXPRESSION:
+$x =  1 |  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="^", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="^", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * int literal "1"
+            * operator "^"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 |  2 ^  3 /dev/null
+DSL EXPRESSION:
+      1 |  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="^", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="^", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * int literal "1"
+            * operator "^"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 ^  2 |  3 /dev/null
+DSL EXPRESSION:
+$x =  1 ^  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="^", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 ^  2 |  3 /dev/null
+DSL EXPRESSION:
+      1 ^  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "^"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 ^  2 &  3 /dev/null
+DSL EXPRESSION:
+$x =  1 ^  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 ^  2 &  3 /dev/null
+DSL EXPRESSION:
+      1 ^  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 &  2 ^  3 /dev/null
+DSL EXPRESSION:
+$x =  1 &  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "^"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 &  2 ^  3 /dev/null
+DSL EXPRESSION:
+      1 &  2 ^  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="^", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="^", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "^"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 &  2 << 3 /dev/null
+DSL EXPRESSION:
+$x =  1 &  2 << 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="<<", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="<<", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "&"
+            * int literal "1"
+            * operator "<<"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 &  2 << 3 /dev/null
+DSL EXPRESSION:
+      1 &  2 << 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="<<", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="<<", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&"
+            * int literal "1"
+            * operator "<<"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 << 2 &  3 /dev/null
+DSL EXPRESSION:
+$x =  1 << 2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="<<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="<<", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "&"
+            * operator "<<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 << 2 &  3 /dev/null
+DSL EXPRESSION:
+      1 << 2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&", type=OPERATOR:
-        text="<<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&", type=OPERATOR:
-        text="<<", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&"
+            * operator "<<"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 +  2 * 3 /dev/null
+DSL EXPRESSION:
+$x =  1 +  2 * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 +  2 * 3 /dev/null
+DSL EXPRESSION:
+      1 +  2 * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 *  2 + 3 /dev/null
+DSL EXPRESSION:
+$x =  1 *  2 + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 *  2 + 3 /dev/null
+DSL EXPRESSION:
+      1 *  2 + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 + (2 * 3) /dev/null
+DSL EXPRESSION:
+$x =  1 + (2 * 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 + (2 * 3) /dev/null
+DSL EXPRESSION:
+      1 + (2 * 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 * (2 + 3) /dev/null
+DSL EXPRESSION:
+$x =  1 * (2 + 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="+", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="+", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * int literal "1"
+            * operator "+"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 * (2 + 3) /dev/null
+DSL EXPRESSION:
+      1 * (2 + 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="+", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="+", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * int literal "1"
+            * operator "+"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = (1 + 2) * 3 /dev/null
+DSL EXPRESSION:
+$x = (1 + 2) * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      (1 + 2) * 3 /dev/null
+DSL EXPRESSION:
+     (1 + 2) * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = (1 * 2) + 3 /dev/null
+DSL EXPRESSION:
+$x = (1 * 2) + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      (1 * 2) + 3 /dev/null
+DSL EXPRESSION:
+     (1 * 2) + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 +   2 ** 3 /dev/null
+DSL EXPRESSION:
+$x =  1 +   2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 +   2 ** 3 /dev/null
+DSL EXPRESSION:
+      1 +   2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 **  2 +  3 /dev/null
+DSL EXPRESSION:
+$x =  1 **  2 +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 **  2 +  3 /dev/null
+DSL EXPRESSION:
+      1 **  2 +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 +  (2 ** 3) /dev/null
+DSL EXPRESSION:
+$x =  1 +  (2 ** 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 +  (2 ** 3) /dev/null
+DSL EXPRESSION:
+      1 +  (2 ** 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 ** (2 +  3) /dev/null
+DSL EXPRESSION:
+$x =  1 ** (2 +  3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="+", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="+", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "**"
+            * int literal "1"
+            * operator "+"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 ** (2 +  3) /dev/null
+DSL EXPRESSION:
+      1 ** (2 +  3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="**", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="+", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="**", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="+", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "**"
+            * int literal "1"
+            * operator "+"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = (1 +  2) ** 3 /dev/null
+DSL EXPRESSION:
+$x = (1 +  2) ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="+", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "**"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      (1 +  2) ** 3 /dev/null
+DSL EXPRESSION:
+     (1 +  2) ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="**", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="**", type=OPERATOR:
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "**"
+            * operator "+"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = (1 ** 2) +  3 /dev/null
+DSL EXPRESSION:
+$x = (1 ** 2) +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      (1 ** 2) +  3 /dev/null
+DSL EXPRESSION:
+     (1 ** 2) +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 *   2 ** 3 /dev/null
+DSL EXPRESSION:
+$x =  1 *   2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 *   2 ** 3 /dev/null
+DSL EXPRESSION:
+      1 *   2 ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 **  2 *  3 /dev/null
+DSL EXPRESSION:
+$x =  1 **  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 **  2 *  3 /dev/null
+DSL EXPRESSION:
+      1 **  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 *  (2 ** 3) /dev/null
+DSL EXPRESSION:
+$x =  1 *  (2 ** 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="**", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 *  (2 ** 3) /dev/null
+DSL EXPRESSION:
+      1 *  (2 ** 3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="**", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * int literal "1"
+            * operator "**"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 ** (2 *  3) /dev/null
+DSL EXPRESSION:
+$x =  1 ** (2 *  3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "**"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 ** (2 *  3) /dev/null
+DSL EXPRESSION:
+      1 ** (2 *  3)
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="**", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="**", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "**"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = (1 *  2) ** 3 /dev/null
+DSL EXPRESSION:
+$x = (1 *  2) ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "**"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      (1 *  2) ** 3 /dev/null
+DSL EXPRESSION:
+     (1 *  2) ** 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="**", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="**", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "**"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = (1 ** 2) *  3 /dev/null
+DSL EXPRESSION:
+$x = (1 ** 2) *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="**", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "*"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      (1 ** 2) *  3 /dev/null
+DSL EXPRESSION:
+     (1 ** 2) *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="*", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="*", type=OPERATOR:
-        text="**", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "*"
+            * operator "**"
+                * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x = -1 +  2 *  3 /dev/null
+DSL EXPRESSION:
+$x = -1 +  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "-"
+                * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      -1 +  2 *  3 /dev/null
+DSL EXPRESSION:
+     -1 +  2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="-", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "-"
+                * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = -1 *  2 +  3 /dev/null
+DSL EXPRESSION:
+$x = -1 *  2 +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="-", type=OPERATOR:
-                    text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="-", type=OPERATOR:
-                    text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "*"
+                * operator "-"
+                    * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      -1 *  2 +  3 /dev/null
+DSL EXPRESSION:
+     -1 *  2 +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "*"
+                * operator "-"
+                    * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 + -2 *  3 /dev/null
+DSL EXPRESSION:
+$x =  1 + -2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="-", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="-", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * operator "-"
+                    * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 + -2 *  3 /dev/null
+DSL EXPRESSION:
+      1 + -2 *  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="-", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * operator "-"
+                    * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 * -2 +  3 /dev/null
+DSL EXPRESSION:
+$x =  1 * -2 +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="-", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="-", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * operator "-"
+                    * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 * -2 +  3 /dev/null
+DSL EXPRESSION:
+      1 * -2 +  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="-", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="-", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * operator "-"
+                    * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 +  2 * -3 /dev/null
+DSL EXPRESSION:
+$x =  1 +  2 * -3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="-", type=OPERATOR:
-                    text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="*", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="-", type=OPERATOR:
-                    text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * operator "-"
+                    * int literal "3"
 
 
 mlr filter -v       1 +  2 * -3 /dev/null
+DSL EXPRESSION:
+      1 +  2 * -3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="-", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="*", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="-", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * int literal "1"
+            * operator "*"
+                * int literal "2"
+                * operator "-"
+                    * int literal "3"
 
 
 mlr put -v $x =  1 *  2 + -3 /dev/null
+DSL EXPRESSION:
+$x =  1 *  2 + -3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="-", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="*", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="-", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * operator "-"
+                * int literal "3"
 
 
 mlr filter -v       1 *  2 + -3 /dev/null
+DSL EXPRESSION:
+      1 *  2 + -3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="-", type=OPERATOR:
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="+", type=OPERATOR:
-        text="*", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="-", type=OPERATOR:
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "+"
+            * operator "*"
+                * int literal "1"
+                * int literal "2"
+            * operator "-"
+                * int literal "3"
 
 
 mlr put -v $x = ~1 |  2 &  3 /dev/null
+DSL EXPRESSION:
+$x = ~1 |  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "~"
+                * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v      ~1 |  2 &  3 /dev/null
+DSL EXPRESSION:
+     ~1 |  2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="~", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "~"
+                * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x = ~1 &  2 |  3 /dev/null
+DSL EXPRESSION:
+$x = ~1 &  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="~", type=OPERATOR:
-                    text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="~", type=OPERATOR:
-                    text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "&"
+                * operator "~"
+                    * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v      ~1 &  2 |  3 /dev/null
+DSL EXPRESSION:
+     ~1 &  2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "&"
+                * operator "~"
+                    * int literal "1"
+                * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 | ~2 &  3 /dev/null
+DSL EXPRESSION:
+$x =  1 | ~2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="~", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="~", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * int literal "1"
+            * operator "&"
+                * operator "~"
+                    * int literal "2"
+                * int literal "3"
 
 
 mlr filter -v       1 | ~2 &  3 /dev/null
+DSL EXPRESSION:
+      1 | ~2 &  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="~", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * int literal "1"
+            * operator "&"
+                * operator "~"
+                    * int literal "2"
+                * int literal "3"
 
 
 mlr put -v $x =  1 & ~2 |  3 /dev/null
+DSL EXPRESSION:
+$x =  1 & ~2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="~", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="~", type=OPERATOR:
-                    text="2", type=NUMERIC_LITERAL.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "&"
+                * int literal "1"
+                * operator "~"
+                    * int literal "2"
+            * int literal "3"
 
 
 mlr filter -v       1 & ~2 |  3 /dev/null
+DSL EXPRESSION:
+      1 & ~2 |  3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="~", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="~", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "&"
+                * int literal "1"
+                * operator "~"
+                    * int literal "2"
+            * int literal "3"
 
 
 mlr put -v $x =  1 |  2 & ~3 /dev/null
+DSL EXPRESSION:
+$x =  1 |  2 & ~3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="~", type=OPERATOR:
-                    text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="&", type=OPERATOR:
-                text="2", type=NUMERIC_LITERAL.
-                text="~", type=OPERATOR:
-                    text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * operator "~"
+                    * int literal "3"
 
 
 mlr filter -v       1 |  2 & ~3 /dev/null
+DSL EXPRESSION:
+      1 |  2 & ~3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="~", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="1", type=NUMERIC_LITERAL.
-        text="&", type=OPERATOR:
-            text="2", type=NUMERIC_LITERAL.
-            text="~", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * int literal "1"
+            * operator "&"
+                * int literal "2"
+                * operator "~"
+                    * int literal "3"
 
 
 mlr put -v $x =  1 &  2 | ~3 /dev/null
+DSL EXPRESSION:
+$x =  1 &  2 | ~3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="~", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="&", type=OPERATOR:
-                text="1", type=NUMERIC_LITERAL.
-                text="2", type=NUMERIC_LITERAL.
-            text="~", type=OPERATOR:
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "|"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * operator "~"
+                * int literal "3"
 
 
 mlr filter -v       1 &  2 | ~3 /dev/null
+DSL EXPRESSION:
+      1 &  2 | ~3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="~", type=OPERATOR:
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="|", type=OPERATOR:
-        text="&", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="2", type=NUMERIC_LITERAL.
-        text="~", type=OPERATOR:
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "|"
+            * operator "&"
+                * int literal "1"
+                * int literal "2"
+            * operator "~"
+                * int literal "3"
 
 
 mlr put -v $x = $a==1 && $b == 1 && $c == 1 /dev/null
+DSL EXPRESSION:
+$x = $a==1 && $b == 1 && $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&&", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="a", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="&&", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="a", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "&&"
+            * operator "&&"
+                * operator "=="
+                    * direct field value "a"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+            * operator "=="
+                * direct field value "c"
+                * int literal "1"
 
 
 mlr filter -v      $a==1 && $b == 1 && $c == 1 /dev/null
+DSL EXPRESSION:
+     $a==1 && $b == 1 && $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&&"
+            * operator "&&"
+                * operator "=="
+                    * direct field value "a"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+            * operator "=="
+                * direct field value "c"
+                * int literal "1"
 
 
 mlr put -v $x = $a==1 || $b == 1 && $c == 1 /dev/null
+DSL EXPRESSION:
+$x = $a==1 || $b == 1 && $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="&&", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="c", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="&&", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="c", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * operator "=="
+                * direct field value "a"
+                * int literal "1"
+            * operator "&&"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "c"
+                    * int literal "1"
 
 
 mlr filter -v      $a==1 || $b == 1 && $c == 1 /dev/null
+DSL EXPRESSION:
+     $a==1 || $b == 1 && $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="a", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-        text="&&", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="a", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-        text="&&", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "=="
+                * direct field value "a"
+                * int literal "1"
+            * operator "&&"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "c"
+                    * int literal "1"
 
 
 mlr put -v $x = $a==1 || $b == 1 || $c == 1 /dev/null
+DSL EXPRESSION:
+$x = $a==1 || $b == 1 || $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="||", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="a", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="||", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="a", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * operator "||"
+                * operator "=="
+                    * direct field value "a"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+            * operator "=="
+                * direct field value "c"
+                * int literal "1"
 
 
 mlr filter -v      $a==1 || $b == 1 || $c == 1 /dev/null
+DSL EXPRESSION:
+     $a==1 || $b == 1 || $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="||", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="||", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "||"
+                * operator "=="
+                    * direct field value "a"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+            * operator "=="
+                * direct field value "c"
+                * int literal "1"
 
 
 mlr put -v $x = $a==1 && $b == 1 || $c == 1 /dev/null
+DSL EXPRESSION:
+$x = $a==1 && $b == 1 || $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="a", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="&&", type=OPERATOR:
-                text="==", type=OPERATOR:
-                    text="a", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-                text="==", type=OPERATOR:
-                    text="b", type=FIELD_NAME.
-                    text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "||"
+            * operator "&&"
+                * operator "=="
+                    * direct field value "a"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+            * operator "=="
+                * direct field value "c"
+                * int literal "1"
 
 
 mlr filter -v      $a==1 && $b == 1 || $c == 1 /dev/null
+DSL EXPRESSION:
+     $a==1 && $b == 1 || $c == 1
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "&&"
+                * operator "=="
+                    * direct field value "a"
+                    * int literal "1"
+                * operator "=="
+                    * direct field value "b"
+                    * int literal "1"
+            * operator "=="
+                * direct field value "c"
+                * int literal "1"
 
 
 mlr put -v $x = $a==1 ? $b == 2 : $c == 3 /dev/null
+DSL EXPRESSION:
+$x = $a==1 ? $b == 2 : $c == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="2", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="? :", type=OPERATOR:
-            text="==", type=OPERATOR:
-                text="a", type=FIELD_NAME.
-                text="1", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="b", type=FIELD_NAME.
-                text="2", type=NUMERIC_LITERAL.
-            text="==", type=OPERATOR:
-                text="c", type=FIELD_NAME.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * operator "?:"
+            * operator "=="
+                * direct field value "a"
+                * int literal "1"
+            * operator "=="
+                * direct field value "b"
+                * int literal "2"
+            * operator "=="
+                * direct field value "c"
+                * int literal "3"
 
 
 mlr filter -v      $a==1 ? $b == 2 : $c == 3 /dev/null
+DSL EXPRESSION:
+     $a==1 ? $b == 2 : $c == 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="? :", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="a", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="b", type=FIELD_NAME.
-            text="2", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="? :", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="a", type=FIELD_NAME.
-            text="1", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="b", type=FIELD_NAME.
-            text="2", type=NUMERIC_LITERAL.
-        text="==", type=OPERATOR:
-            text="c", type=FIELD_NAME.
-            text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "?:"
+            * operator "=="
+                * direct field value "a"
+                * int literal "1"
+            * operator "=="
+                * direct field value "b"
+                * int literal "2"
+            * operator "=="
+                * direct field value "c"
+                * int literal "3"
 
 
 mlr put -v $x = true /dev/null
+DSL EXPRESSION:
+$x = true
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="true", type=BOOLEAN_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="true", type=BOOLEAN_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "x"
+        * bool literal "true"
 
 
 mlr filter -v      true /dev/null
+DSL EXPRESSION:
+     true
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="true", type=BOOLEAN_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="true", type=BOOLEAN_LITERAL.
+* statement block
+    * bare boolean
+        * bool literal "true"
 
 
 mlr put -v true || 1==0; $x = 3 /dev/null
+DSL EXPRESSION:
+true || 1==0; $x = 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * bool literal "true"
+            * operator "=="
+                * int literal "1"
+                * int literal "0"
+    * assignment "="
+        * direct field value "x"
+        * int literal "3"
 
 
 mlr filter -v         true || 1==0 /dev/null
+DSL EXPRESSION:
+        true || 1==0
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * bool literal "true"
+            * operator "=="
+                * int literal "1"
+                * int literal "0"
 
 
 mlr put -v 1==0 || false; $x = 3 /dev/null
+DSL EXPRESSION:
+1==0 || false; $x = 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "=="
+                * int literal "1"
+                * int literal "0"
+            * bool literal "false"
+    * assignment "="
+        * direct field value "x"
+        * int literal "3"
 
 
 mlr filter -v         1==0 || false /dev/null
+DSL EXPRESSION:
+        1==0 || false
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="||", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="||", type=OPERATOR:
-        text="==", type=OPERATOR:
-            text="1", type=NUMERIC_LITERAL.
-            text="0", type=NUMERIC_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
+* statement block
+    * bare boolean
+        * operator "||"
+            * operator "=="
+                * int literal "1"
+                * int literal "0"
+            * bool literal "false"
 
 
 mlr put -v true && false; $x = 3 /dev/null
+DSL EXPRESSION:
+true && false; $x = 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&&", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&&", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&&"
+            * bool literal "true"
+            * bool literal "false"
+    * assignment "="
+        * direct field value "x"
+        * int literal "3"
 
 
 mlr filter -v         true && false /dev/null
+DSL EXPRESSION:
+        true && false
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&&", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&&", type=OPERATOR:
-        text="true", type=BOOLEAN_LITERAL.
-        text="false", type=BOOLEAN_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&&"
+            * bool literal "true"
+            * bool literal "false"
 
 
 mlr put -v true && false && true; $x = 3 /dev/null
+DSL EXPRESSION:
+true && false && true; $x = 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="true", type=BOOLEAN_LITERAL.
-            text="false", type=BOOLEAN_LITERAL.
-        text="true", type=BOOLEAN_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="true", type=BOOLEAN_LITERAL.
-            text="false", type=BOOLEAN_LITERAL.
-        text="true", type=BOOLEAN_LITERAL.
-    text="=", type=SREC_ASSIGNMENT:
-        text="x", type=FIELD_NAME.
-        text="3", type=NUMERIC_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&&"
+            * operator "&&"
+                * bool literal "true"
+                * bool literal "false"
+            * bool literal "true"
+    * assignment "="
+        * direct field value "x"
+        * int literal "3"
 
 
 mlr filter -v         true && false && true /dev/null
+DSL EXPRESSION:
+        true && false && true
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="true", type=BOOLEAN_LITERAL.
-            text="false", type=BOOLEAN_LITERAL.
-        text="true", type=BOOLEAN_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="&&", type=OPERATOR:
-        text="&&", type=OPERATOR:
-            text="true", type=BOOLEAN_LITERAL.
-            text="false", type=BOOLEAN_LITERAL.
-        text="true", type=BOOLEAN_LITERAL.
+* statement block
+    * bare boolean
+        * operator "&&"
+            * operator "&&"
+                * bool literal "true"
+                * bool literal "false"
+            * bool literal "true"
 
 
 mlr put -v $y += $x + 3 /dev/null
+DSL EXPRESSION:
+$y += $x + 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="+", type=OPERATOR:
-                text="x", type=FIELD_NAME.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="+", type=OPERATOR:
-                text="x", type=FIELD_NAME.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "+"
+            * direct field value "y"
+            * operator "+"
+                * direct field value "x"
+                * int literal "3"
 
 
 mlr put -v $y += $x * 3 /dev/null
+DSL EXPRESSION:
+$y += $x * 3
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="*", type=OPERATOR:
-                text="x", type=FIELD_NAME.
-                text="3", type=NUMERIC_LITERAL.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="*", type=OPERATOR:
-                text="x", type=FIELD_NAME.
-                text="3", type=NUMERIC_LITERAL.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "+"
+            * direct field value "y"
+            * operator "*"
+                * direct field value "x"
+                * int literal "3"
 
 
 mlr put -v $y ||= $x /dev/null
+DSL EXPRESSION:
+$y ||= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="||", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "||"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y ^^= $x /dev/null
+DSL EXPRESSION:
+$y ^^= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="^^", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "^^"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y &&= $x /dev/null
+DSL EXPRESSION:
+$y &&= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="&&", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="&&", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "&&"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y |=  $x /dev/null
+DSL EXPRESSION:
+$y |=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="|", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "|"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y ^=  $x /dev/null
+DSL EXPRESSION:
+$y ^=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="^", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "^"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y &=  $x /dev/null
+DSL EXPRESSION:
+$y &=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="&", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "^"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y <<= $x /dev/null
+DSL EXPRESSION:
+$y <<= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="<<", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="<<", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "<<"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y >>= $x /dev/null
+DSL EXPRESSION:
+$y >>= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text=">>", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text=">>", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator ">>"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y +=  $x /dev/null
+DSL EXPRESSION:
+$y +=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="+", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "+"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y -=  $x /dev/null
+DSL EXPRESSION:
+$y -=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="-", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "-"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y .=  $x /dev/null
+DSL EXPRESSION:
+$y .=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text=".", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text=".", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "."
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y *=  $x /dev/null
+DSL EXPRESSION:
+$y *=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="*", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "*"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y /=  $x /dev/null
+DSL EXPRESSION:
+$y /=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="/", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "/"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y //= $x /dev/null
+DSL EXPRESSION:
+$y //= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="//", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "//"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y %=  $x /dev/null
+DSL EXPRESSION:
+$y %=  $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="%", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "%"
+            * direct field value "y"
+            * direct field value "x"
 
 
 mlr put -v $y **= $x /dev/null
+DSL EXPRESSION:
+$y **= $x
 RAW AST:
-
-AST ROOT:
-text="block", type=STATEMENT_BLOCK:
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
-
-BLOCKED AST:
-
-MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: subframe_var_count=1 max_subframe_depth=1 max_var_depth=1
-    text="=", type=SREC_ASSIGNMENT:
-        text="y", type=FIELD_NAME.
-        text="**", type=OPERATOR:
-            text="y", type=FIELD_NAME.
-            text="x", type=FIELD_NAME.
+* statement block
+    * assignment "="
+        * direct field value "y"
+        * operator "**"
+            * direct field value "y"
+            * direct field value "x"