diff --git a/c/mapping/mapper_put_or_filter.c b/c/mapping/mapper_put_or_filter.c
index b16962379..cbb72b7fe 100644
--- a/c/mapping/mapper_put_or_filter.c
+++ b/c/mapping/mapper_put_or_filter.c
@@ -276,7 +276,7 @@ static mapper_t* shared_parse_cli(int* pargi, int argc, char** argv,
 		} else if (streq(argv[argi], "-v")) {
 			print_ast = TRUE;
 			argi += 1;
-		} else if (streq(argv[argi], "--tsa")) { // xxx to on-line help
+		} else if (streq(argv[argi], "-a")) { // xxx to on-line help
 			trace_stack_allocation = TRUE;
 			argi += 1;
 		} else if (streq(argv[argi], "-t")) {
diff --git a/c/mapping/mlr_dsl_ast.c b/c/mapping/mlr_dsl_ast.c
index 5262a1280..78f757887 100644
--- a/c/mapping/mlr_dsl_ast.c
+++ b/c/mapping/mlr_dsl_ast.c
@@ -178,15 +178,15 @@ static void mlr_dsl_ast_node_print_aux(mlr_dsl_ast_node_t* pnode, int level, FIL
 		(pnode->pchildren != NULL) ? ":" : ".");
 
 	if (pnode->frame_relative_index != MD_UNUSED_INDEX)
-		fprintf(o, " fridx=%d", pnode->frame_relative_index);
+		fprintf(o, " frame_relative_index=%d", pnode->frame_relative_index);
 	if (pnode->upstack_frame_count != MD_UNUSED_INDEX)
-		fprintf(o, " gridx=%d", pnode->upstack_frame_count);
+		fprintf(o, " upstack_frame_count=%d", pnode->upstack_frame_count);
 	if (pnode->absolute_index != MD_UNUSED_INDEX)
-		fprintf(o, " absidx=%d", pnode->absolute_index);
+		fprintf(o, " absolute_index=%d", pnode->absolute_index);
 	if (pnode->frame_var_count != MD_UNUSED_INDEX)
-		fprintf(o, " frct=%d", pnode->frame_var_count);
+		fprintf(o, " frame_var_count=%d", pnode->frame_var_count);
 	if (pnode->max_var_depth != MD_UNUSED_INDEX)
-		fprintf(o, " maxct=%d", pnode->max_var_depth);
+		fprintf(o, " max_var_depth=%d", pnode->max_var_depth);
 
 	fprintf(o, "\n");
 
diff --git a/c/mapping/mlr_dsl_cst.c b/c/mapping/mlr_dsl_cst.c
index 76df4dcfc..de335716c 100644
--- a/c/mapping/mlr_dsl_cst.c
+++ b/c/mapping/mlr_dsl_cst.c
@@ -128,12 +128,18 @@ mlr_dsl_cst_t* mlr_dsl_cst_alloc(mlr_dsl_ast_t* past, int print_ast, int trace_s
 				MLR_GLOBALS.bargv0, __FILE__, __LINE__);
 			exit(1);
 		}
-		cst_top_level_statement_block_t* pblock = cst_top_level_statement_block_alloc(pnode->max_var_depth);
+		if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+			fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n", // xxx funcify
+				MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+			exit(1);
+		}
+		cst_top_level_statement_block_t* pblock = cst_top_level_statement_block_alloc(pnode->max_var_depth, pnode->frame_var_count);
 		for (sllve_t* pf = pnode->pchildren->phead; pf != NULL; pf = pf->pnext) {
 			mlr_dsl_ast_node_t* plistnode = get_list_for_block(pnode);
 			for (sllve_t* pg = plistnode->pchildren->phead; pg != NULL; pg = pg->pnext) {
 				mlr_dsl_ast_node_t* pchild = pg->pvvalue;
-				sllv_append(pblock->pstatements, mlr_dsl_cst_alloc_statement(pcst, pchild,
+				// xxx funcify here & throughout?
+				sllv_append(pblock->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pchild,
 					type_inferencing, context_flags | IN_BEGIN_OR_END));
 			}
 		}
@@ -153,12 +159,17 @@ mlr_dsl_cst_t* mlr_dsl_cst_alloc(mlr_dsl_ast_t* past, int print_ast, int trace_s
 				MLR_GLOBALS.bargv0, __FILE__, __LINE__);
 			exit(1);
 		}
-		cst_top_level_statement_block_t* pblock = cst_top_level_statement_block_alloc(pnode->max_var_depth);
+		if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+			fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n", // xxx funcify
+				MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+			exit(1);
+		}
+		cst_top_level_statement_block_t* pblock = cst_top_level_statement_block_alloc(pnode->max_var_depth, pnode->frame_var_count);
 		for (sllve_t* pf = pnode->pchildren->phead; pf != NULL; pf = pf->pnext) {
 			mlr_dsl_ast_node_t* plistnode = get_list_for_block(pnode);
 			for (sllve_t* pg = plistnode->pchildren->phead; pg != NULL; pg = pg->pnext) {
 				mlr_dsl_ast_node_t* pchild = pg->pvvalue;
-				sllv_append(pblock->pstatements, mlr_dsl_cst_alloc_statement(pcst, pchild,
+				sllv_append(pblock->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pchild,
 					type_inferencing, context_flags | IN_BEGIN_OR_END));
 			}
 		}
@@ -175,16 +186,22 @@ mlr_dsl_cst_t* mlr_dsl_cst_alloc(mlr_dsl_ast_t* past, int print_ast, int trace_s
 			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
 		exit(1);
 	}
-	pcst->pmain_block = cst_top_level_statement_block_alloc(pcst->paast->pmain_block->max_var_depth);
+	if (pcst->paast->pmain_block->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n", // xxx funcify
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	pcst->pmain_block = cst_top_level_statement_block_alloc(pcst->paast->pmain_block->max_var_depth,
+		pcst->paast->pmain_block->frame_var_count);
 	for (sllve_t* pe = pcst->paast->pmain_block->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pnode = pe->pvvalue;
 
 		// The last statement of mlr filter must be a bare boolean.
 		if (do_final_filter && pe->pnext == NULL) {
-			sllv_append(pcst->pmain_block->pstatements, mlr_dsl_cst_alloc_final_filter_statement(
+			sllv_append(pcst->pmain_block->pstatement_block->pstatements, mlr_dsl_cst_alloc_final_filter_statement(
 				pcst, pnode, negate_final_filter, type_inferencing, context_flags | IN_MLR_FINAL_FILTER));
 		} else {
-			sllv_append(pcst->pmain_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pnode,
+			sllv_append(pcst->pmain_block->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pnode,
 				type_inferencing, context_flags));
 		}
 	}
diff --git a/c/mapping/mlr_dsl_cst.h b/c/mapping/mlr_dsl_cst.h
index c02e04b4b..43e370ad9 100644
--- a/c/mapping/mlr_dsl_cst.h
+++ b/c/mapping/mlr_dsl_cst.h
@@ -71,16 +71,6 @@ typedef struct _cst_outputs_t {
 	cli_writer_opts_t* pwriter_opts;
 } cst_outputs_t;
 
-// ----------------------------------------------------------------
-typedef struct _cst_top_level_statement_block_t {
-	local_stack_t* pstack;
-	int max_var_depth;
-	sllv_t* pstatements;
-} cst_top_level_statement_block_t;
-
-cst_top_level_statement_block_t* cst_top_level_statement_block_alloc(int max_var_depth);
-void cst_top_level_statement_block_free(cst_top_level_statement_block_t* pblock);
-
 // ----------------------------------------------------------------
 typedef struct _cst_statement_block_t {
 	int frame_var_count;
@@ -90,6 +80,16 @@ typedef struct _cst_statement_block_t {
 cst_statement_block_t* cst_statement_block_alloc(int frame_var_count);
 void cst_statement_block_free(cst_statement_block_t* pblock);
 
+// ----------------------------------------------------------------
+typedef struct _cst_top_level_statement_block_t {
+	local_stack_t* pstack;
+	int max_var_depth;
+	cst_statement_block_t* pstatement_block;
+} cst_top_level_statement_block_t;
+
+cst_top_level_statement_block_t* cst_top_level_statement_block_alloc(int max_var_depth, int frame_var_count);
+void cst_top_level_statement_block_free(cst_top_level_statement_block_t* pblock);
+
 // ----------------------------------------------------------------
 // Generic handler for a statement.
 typedef void mlr_dsl_cst_node_handler_func_t(
@@ -114,9 +114,9 @@ typedef struct _mlr_dsl_cst_statement_vararg_t {
 
 // Handler for statement lists: begin/main/end; cond/if/for/while/do-while.
 typedef void mlr_dsl_cst_statement_block_handler_t(
-	sllv_t*        pcst_statements, // xxx rename / work in block
-	variables_t*   pvars,
-	cst_outputs_t* pcst_outputs);
+	cst_statement_block_t* pblock,
+	variables_t*           pvars,
+	cst_outputs_t*         pcst_outputs);
 
 // ----------------------------------------------------------------
 // MLR_DSL_CST_STATEMENT OBJECT
@@ -202,7 +202,7 @@ typedef struct _mlr_dsl_cst_statement_t {
 	int flush_every_record;
 
 	// Pattern-action blocks, while, for, etc.
-	sllv_t* pblock_statements; // xxx replace
+	cst_statement_block_t* pstatement_block;
 
 	// if-elif-elif-else:
 	sllv_t* pif_chain_statements;
@@ -284,9 +284,15 @@ void mlr_dsl_cst_handle_top_level_statement_block(
 	cst_outputs_t* pcst_outputs);
 
 // Recursive entry point: block bodies for begin, main, end; cond, if, for, while.
-void mlr_dsl_cst_handle_statement_block( // xxx rename to handle statement block
-	sllv_t*      pcst_statements,
-	variables_t* pvars,
+void mlr_dsl_cst_handle_statement_block(
+	cst_statement_block_t* pblock,
+	variables_t*           pvars,
+	cst_outputs_t*         pcst_outputs);
+
+// Statement lists which are not curly-braced bodies: start/continuation/update statements for triple-for.
+void mlr_dsl_cst_handle_statement_list(
+	sllv_t*        pstatements,
+	variables_t*   pvars,
 	cst_outputs_t* pcst_outputs);
 
 // ================================================================
diff --git a/c/mapping/mlr_dsl_cst_func_subr.c b/c/mapping/mlr_dsl_cst_func_subr.c
index e4a1962c6..de4fc70af 100644
--- a/c/mapping/mlr_dsl_cst_func_subr.c
+++ b/c/mapping/mlr_dsl_cst_func_subr.c
@@ -85,7 +85,12 @@ udf_defsite_state_t* mlr_dsl_cst_alloc_udf(mlr_dsl_cst_t* pcst, mlr_dsl_ast_node
 			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
 		exit(1);
 	}
-	pcst_udf_state->ptop_level_block = cst_top_level_statement_block_alloc(pnode->max_var_depth);
+	if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n", // xxx funcify
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	pcst_udf_state->ptop_level_block = cst_top_level_statement_block_alloc(pnode->max_var_depth, pnode->frame_var_count);
 
 	for (sllve_t* pe = pbody_node->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
@@ -95,7 +100,8 @@ udf_defsite_state_t* mlr_dsl_cst_alloc_udf(mlr_dsl_cst_t* pcst, mlr_dsl_ast_node
 				MLR_GLOBALS.bargv0);
 			exit(1);
 		}
-		sllv_append(pcst_udf_state->ptop_level_block->pstatements,
+		// xxx funcify here & thruout
+		sllv_append(pcst_udf_state->ptop_level_block->pstatement_block->pstatements,
 			mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node, type_inferencing, context_flags | IN_FUNC_DEF));
 	}
 
@@ -145,7 +151,7 @@ static mv_t cst_udf_process_callback(void* pvstate, int arity, mv_t* args, varia
 	// Compute the function value
 	cst_outputs_t* pcst_outputs = NULL; // Functions only produce output via their return values
 
-	for (sllve_t* pe = pstate->ptop_level_block->pstatements->phead; pe != NULL; pe = pe->pnext) {
+	for (sllve_t* pe = pstate->ptop_level_block->pstatement_block->pstatements->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_cst_statement_t* pstatement = pe->pvvalue;
 		pstatement->pnode_handler(pstatement, pvars, pcst_outputs);
 		if (loop_stack_get(pvars->ploop_stack) != 0) {
@@ -223,7 +229,12 @@ subr_defsite_t* mlr_dsl_cst_alloc_subroutine(mlr_dsl_cst_t* pcst, mlr_dsl_ast_no
 			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
 		exit(1);
 	}
-	pstate->ptop_level_block = cst_top_level_statement_block_alloc(pnode->max_var_depth);
+	if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n", // xxx funcify
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	pstate->ptop_level_block = cst_top_level_statement_block_alloc(pnode->max_var_depth, pnode->frame_var_count);
 
 	for (sllve_t* pe = pbody_node->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
@@ -235,7 +246,7 @@ subr_defsite_t* mlr_dsl_cst_alloc_subroutine(mlr_dsl_cst_t* pcst, mlr_dsl_ast_no
 		}
 		mlr_dsl_cst_statement_t* pstatement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags | IN_SUBR_DEF);
-		sllv_append(pstate->ptop_level_block->pstatements, pstatement);
+		sllv_append(pstate->ptop_level_block->pstatement_block->pstatements, pstatement);
 	}
 
 	return pstate;
@@ -271,7 +282,7 @@ void mlr_dsl_cst_execute_subroutine(subr_defsite_t* pstate, variables_t* pvars,
 		bind_stack_set(pvars->pbind_stack, pstate->parameter_names[i], &args[i], FREE_ENTRY_VALUE);
 	}
 
-	for (sllve_t* pe = pstate->ptop_level_block->pstatements->phead; pe != NULL; pe = pe->pnext) {
+	for (sllve_t* pe = pstate->ptop_level_block->pstatement_block->pstatements->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_cst_statement_t* pstatement = pe->pvvalue;
 		pstatement->pnode_handler(pstatement, pvars, pcst_outputs);
 		if (loop_stack_get(pvars->ploop_stack) != 0) {
diff --git a/c/mapping/mlr_dsl_cst_statements.c b/c/mapping/mlr_dsl_cst_statements.c
index c42e15af4..f007f7e7b 100644
--- a/c/mapping/mlr_dsl_cst_statements.c
+++ b/c/mapping/mlr_dsl_cst_statements.c
@@ -118,10 +118,10 @@ static sllv_t* allocate_keylist_evaluators_from_oosvar_node(
 
 static void cst_statement_vararg_free(mlr_dsl_cst_statement_vararg_t* pvararg);
 
-static void handle_statement_list_with_break_continue(
-	sllv_t*        pcst_statements,
-	variables_t*   pvars,
-	cst_outputs_t* pcst_outputs);
+static void handle_statement_block_with_break_continue(
+	cst_statement_block_t* pblock,
+	variables_t*           pvars,
+	cst_outputs_t*         pcst_outputs);
 
 static cst_statement_handler_t handle_subr_callsite;
 static cst_statement_handler_t handle_return_void;
@@ -223,29 +223,6 @@ static cst_statement_handler_t handle_dump_to_file;
 static cst_statement_handler_t handle_print;
 
 // ================================================================
-cst_top_level_statement_block_t* cst_top_level_statement_block_alloc(int max_var_depth) {
-	cst_top_level_statement_block_t* pblock = mlr_malloc_or_die(sizeof(cst_top_level_statement_block_t));
-
-	pblock->max_var_depth = max_var_depth;
-	pblock->pstack        = local_stack_alloc(max_var_depth);
-	pblock->pstatements   = sllv_alloc();
-
-	return pblock;
-}
-
-// ----------------------------------------------------------------
-void cst_top_level_statement_block_free(cst_top_level_statement_block_t* pblock) {
-	if (pblock == NULL)
-		return;
-	local_stack_free(pblock->pstack);
-	for (sllve_t* pe = pblock->pstatements->phead; pe != NULL; pe = pe->pnext) {
-		mlr_dsl_cst_statement_free(pe->pvvalue);
-	}
-	sllv_free(pblock->pstatements);
-	free(pblock);
-}
-
-// ----------------------------------------------------------------
 cst_statement_block_t* cst_statement_block_alloc(int frame_var_count) {
 	cst_statement_block_t* pblock = mlr_malloc_or_die(sizeof(cst_statement_block_t));
 
@@ -266,6 +243,27 @@ void cst_statement_block_free(cst_statement_block_t* pblock) {
 	free(pblock);
 }
 
+// ================================================================
+cst_top_level_statement_block_t* cst_top_level_statement_block_alloc(int max_var_depth, int frame_var_count) {
+	cst_top_level_statement_block_t* pblock = mlr_malloc_or_die(sizeof(cst_top_level_statement_block_t));
+
+	pblock->max_var_depth = max_var_depth;
+	pblock->pstack        = local_stack_alloc(max_var_depth);
+	pblock->pstatement_block = cst_statement_block_alloc(frame_var_count);
+
+	return pblock;
+}
+
+// ----------------------------------------------------------------
+void cst_top_level_statement_block_free(cst_top_level_statement_block_t* pblock) {
+	if (pblock == NULL)
+		return;
+	// xxx rename pblock to ptop_level_block here & thruout
+	local_stack_free(pblock->pstack);
+	cst_statement_block_free(pblock->pstatement_block);
+	free(pblock);
+}
+
 // ================================================================
 // The parser accepts many things that are invalid, e.g.
 // * begin{end{}} -- begin/end not at top level
@@ -626,7 +624,7 @@ static mlr_dsl_cst_statement_t* alloc_blank() {
 	pstatement->pvarargs                                = NULL;
 	pstatement->do_full_prefixing                       = FALSE;
 	pstatement->flush_every_record                      = TRUE;
-	pstatement->pblock_statements                       = NULL;
+	pstatement->pstatement_block                        = NULL;
 	pstatement->pif_chain_statements                    = NULL;
 	pstatement->pfor_oosvar_k_names                     = NULL;
 	pstatement->for_v_name                              = NULL;
@@ -1013,20 +1011,27 @@ static mlr_dsl_cst_statement_t* alloc_while(mlr_dsl_cst_t* pcst, mlr_dsl_ast_nod
 	// Right child node is the list of statements in the body.
 	mlr_dsl_ast_node_t* pleft  = pnode->pchildren->phead->pvvalue;
 	mlr_dsl_ast_node_t* pright = pnode->pchildren->phead->pnext->pvvalue;
-	sllv_t* pblock_statements = sllv_alloc();
+
+	// xxx funcify: mlr_assert
+	if (pright->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	// xxx at alloc_blank
+	pstatement->pstatement_block = cst_statement_block_alloc(pright->frame_var_count);
 
 	for (sllve_t* pe = pright->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		mlr_dsl_cst_statement_t *pstatement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		mlr_dsl_cst_statement_t *pchild_statement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags);
-		sllv_append(pblock_statements, pstatement);
+		sllv_append(pstatement->pstatement_block->pstatements, pchild_statement); // xxx funcify
 	}
 
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 	pstatement->pnode_handler = handle_while;
-	pstatement->pblock_handler = handle_statement_list_with_break_continue;
+	pstatement->pblock_handler = handle_statement_block_with_break_continue;
 	pstatement->prhs_evaluator = rval_evaluator_alloc_from_ast(pleft, pcst->pfmgr, type_inferencing, context_flags);
-	pstatement->pblock_statements = pblock_statements;
 	return pstatement;
 }
 
@@ -1039,20 +1044,27 @@ static mlr_dsl_cst_statement_t* alloc_do_while(mlr_dsl_cst_t* pcst, mlr_dsl_ast_
 	// Right child node is the AST for the boolean expression.
 	mlr_dsl_ast_node_t* pleft  = pnode->pchildren->phead->pvvalue;
 	mlr_dsl_ast_node_t* pright = pnode->pchildren->phead->pnext->pvvalue;
-	sllv_t* pblock_statements = sllv_alloc();
+
+	// xxx funcify: mlr_assert
+	if (pleft->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	// xxx at alloc_blank
+	pstatement->pstatement_block = cst_statement_block_alloc(pleft->frame_var_count);
 
 	for (sllve_t* pe = pleft->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		mlr_dsl_cst_statement_t *pstatement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		mlr_dsl_cst_statement_t *pchild_statement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags);
-		sllv_append(pblock_statements, pstatement);
+		sllv_append(pstatement->pstatement_block->pstatements, pchild_statement);
 	}
 
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 	pstatement->pnode_handler = handle_do_while;
-	pstatement->pblock_handler = handle_statement_list_with_break_continue;
+	pstatement->pblock_handler = handle_statement_block_with_break_continue;
 	pstatement->prhs_evaluator = rval_evaluator_alloc_from_ast(pright, pcst->pfmgr, type_inferencing, context_flags);
-	pstatement->pblock_statements = pblock_statements;
 	return pstatement;
 }
 
@@ -1093,16 +1105,23 @@ static mlr_dsl_cst_statement_t* alloc_for_srec(mlr_dsl_cst_t* pcst, mlr_dsl_ast_
 	pstatement->for_srec_k_name = pknode->text;
 	pstatement->for_v_name = pvnode->text;
 
-	sllv_t* pblock_statements = sllv_alloc();
+	// xxx funcify: mlr_assert
+	if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	// xxx at alloc_blank
+	pstatement->pstatement_block = cst_statement_block_alloc(pnode->frame_var_count);
+
 	for (sllve_t* pe = pright->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		sllv_append(pblock_statements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		sllv_append(pstatement->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags));
 	}
 
 	pstatement->pnode_handler = handle_for_srec;
-	pstatement->pblock_handler = handle_statement_list_with_break_continue;
-	pstatement->pblock_statements = pblock_statements;
+	pstatement->pblock_handler = handle_statement_block_with_break_continue;
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 	pstatement->ptype_infererenced_srec_field_getter =
 		(type_inferencing == TYPE_INFER_STRING_ONLY)      ? get_srec_value_string_only_aux :
@@ -1192,17 +1211,24 @@ static mlr_dsl_cst_statement_t* alloc_for_oosvar(mlr_dsl_cst_t* pcst, mlr_dsl_as
 	pstatement->poosvar_lhs_keylist_evaluators = allocate_keylist_evaluators_from_oosvar_node(
 		pcst, pmiddle, type_inferencing, context_flags);
 
-	sllv_t* pblock_statements = sllv_alloc();
+	// xxx funcify: mlr_assert
+	if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	// xxx at alloc_blank
+	pstatement->pstatement_block = cst_statement_block_alloc(pnode->frame_var_count);
+
 	for (sllve_t* pe = pright->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		sllv_append(pblock_statements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		sllv_append(pstatement->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags));
 	}
-	pstatement->pblock_statements = pblock_statements;
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 
 	pstatement->pnode_handler = handle_for_oosvar;
-	pstatement->pblock_handler = handle_statement_list_with_break_continue;
+	pstatement->pblock_handler = handle_statement_block_with_break_continue;
 
 	return pstatement;
 }
@@ -1225,17 +1251,24 @@ static mlr_dsl_cst_statement_t* alloc_for_oosvar_key_only(mlr_dsl_cst_t* pcst, m
 	pstatement->poosvar_lhs_keylist_evaluators = allocate_keylist_evaluators_from_oosvar_node(
 		pcst, pmiddle, type_inferencing, context_flags);
 
-	sllv_t* pblock_statements = sllv_alloc();
+	// xxx funcify: mlr_assert
+	if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	// xxx at alloc_blank
+	pstatement->pstatement_block = cst_statement_block_alloc(pnode->frame_var_count);
+
 	for (sllve_t* pe = pright->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		sllv_append(pblock_statements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		sllv_append(pstatement->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags));
 	}
-	pstatement->pblock_statements = pblock_statements;
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 
 	pstatement->pnode_handler = handle_for_oosvar_key_only;
-	pstatement->pblock_handler = handle_statement_list_with_break_continue;
+	pstatement->pblock_handler = handle_statement_block_with_break_continue;
 
 	return pstatement;
 }
@@ -1287,17 +1320,24 @@ static mlr_dsl_cst_statement_t* alloc_triple_for(mlr_dsl_cst_t* pcst, mlr_dsl_as
 			type_inferencing, context_flags & ~IN_BREAKABLE));
 	}
 
-	pstatement->pblock_statements = sllv_alloc();
+	// xxx funcify: mlr_assert : with mlr_dsl_ast_node_print(pnode)
+	if (pnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	pstatement->pstatement_block = cst_statement_block_alloc(pnode->frame_var_count);
+
 	for (sllve_t* pe = pbody_statements_node->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		sllv_append(pstatement->pblock_statements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		sllv_append(pstatement->pstatement_block->pstatements, mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags));
 	}
 
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 
 	pstatement->pnode_handler = handle_triple_for;
-	pstatement->pblock_handler = handle_statement_list_with_break_continue;
+	pstatement->pblock_handler = handle_statement_block_with_break_continue;
 
 	return pstatement;
 }
@@ -1327,23 +1367,30 @@ static mlr_dsl_cst_statement_t* alloc_conditional_block(mlr_dsl_cst_t* pcst, mlr
 	// Left node is the AST for the boolean expression.
 	// Right node is a list of statements to be executed if the left evaluates to true.
 	mlr_dsl_ast_node_t* pleft  = pnode->pchildren->phead->pvvalue;
-	sllv_t* pblock_statements = sllv_alloc();
 
 	mlr_dsl_ast_node_t* pright = pnode->pchildren->phead->pnext->pvvalue;
+
+	// xxx funcify: mlr_assert
+	if (pright->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	pstatement->pstatement_block = cst_statement_block_alloc(pright->frame_var_count);
+
 	for (sllve_t* pe = pright->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		mlr_dsl_cst_statement_t *pstatement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		mlr_dsl_cst_statement_t *pchild_statement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags);
-		sllv_append(pblock_statements, pstatement);
+		sllv_append(pstatement->pstatement_block->pstatements, pchild_statement);
 	}
 
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
 	pstatement->pnode_handler = handle_conditional_block;
 	pstatement->pblock_handler = (context_flags & IN_BREAKABLE)
-		? handle_statement_list_with_break_continue
+		? handle_statement_block_with_break_continue
 		: mlr_dsl_cst_handle_statement_block;
 	pstatement->prhs_evaluator = rval_evaluator_alloc_from_ast(pleft, pcst->pfmgr, type_inferencing, context_flags);
-	pstatement->pblock_statements = pblock_statements;
 	return pstatement;
 }
 
@@ -1423,7 +1470,7 @@ static mlr_dsl_cst_statement_t* alloc_if_head(mlr_dsl_cst_t* pcst, mlr_dsl_ast_n
 
 	pstatement->pnode_handler = handle_if_head;
 	pstatement->pblock_handler = (context_flags & IN_BREAKABLE)
-		?  handle_statement_list_with_break_continue
+		?  handle_statement_block_with_break_continue
 		: mlr_dsl_cst_handle_statement_block;
 	pstatement->pif_chain_statements = pif_chain_statements;
 	return pstatement;
@@ -1434,13 +1481,20 @@ static mlr_dsl_cst_statement_t* alloc_if_item(mlr_dsl_cst_t* pcst, mlr_dsl_ast_n
 {
 	mlr_dsl_cst_statement_t* pstatement = alloc_blank();
 
-	sllv_t* pblock_statements = sllv_alloc();
+	// xxx funcify: mlr_assert
+	if (plistnode->frame_var_count == MD_UNUSED_INDEX) {
+		fprintf(stderr, "%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	// xxx at alloc_blank
+	pstatement->pstatement_block = cst_statement_block_alloc(plistnode->frame_var_count);
 
 	for (sllve_t* pe = plistnode->pchildren->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_ast_node_t* pbody_ast_node = pe->pvvalue;
-		mlr_dsl_cst_statement_t *pstatement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
+		mlr_dsl_cst_statement_t *pchild_statement = mlr_dsl_cst_alloc_statement(pcst, pbody_ast_node,
 			type_inferencing, context_flags);
-		sllv_append(pblock_statements, pstatement);
+		sllv_append(pstatement->pstatement_block->pstatements, pchild_statement);
 	}
 
 	pstatement->pframe = bind_stack_frame_alloc_unfenced();
@@ -1449,7 +1503,6 @@ static mlr_dsl_cst_statement_t* alloc_if_item(mlr_dsl_cst_t* pcst, mlr_dsl_ast_n
 		? rval_evaluator_alloc_from_ast(pexprnode, pcst->pfmgr,
 			type_inferencing, context_flags) // if-statement or elif-statement
 		: rval_evaluator_alloc_from_boolean(TRUE); // else-statement
-	pstatement->pblock_statements = pblock_statements;
 	return pstatement;
 }
 
@@ -1945,11 +1998,7 @@ void mlr_dsl_cst_statement_free(mlr_dsl_cst_statement_t* pstatement) {
 		sllv_free(pstatement->pvarargs);
 	}
 
-	if (pstatement->pblock_statements != NULL) {
-		for (sllve_t* pe = pstatement->pblock_statements->phead; pe != NULL; pe = pe->pnext)
-			mlr_dsl_cst_statement_free(pe->pvvalue);
-		sllv_free(pstatement->pblock_statements);
-	}
+	cst_statement_block_free(pstatement->pstatement_block);
 
 	if (pstatement->pif_chain_statements != NULL) {
 		for (sllve_t* pe = pstatement->pif_chain_statements->phead; pe != NULL; pe = pe->pnext)
@@ -2061,25 +2110,23 @@ void mlr_dsl_cst_handle_top_level_statement_block(
 	local_stack_enter(ptop_level_block->pstack);
 
 	// xxx adapt callee to also handle local stack
-	mlr_dsl_cst_handle_statement_block(ptop_level_block->pstatements, pvars, pcst_outputs);
+	mlr_dsl_cst_handle_statement_block(ptop_level_block->pstatement_block, pvars, pcst_outputs);
 
 	bind_stack_clear(pvars->pbind_stack); // clear the baseframe // xxx rm
 	local_stack_exit(ptop_level_block->pstack);
 }
 
 // ================================================================
-
-// xxx whack
-
 // This is for statement lists not recursively contained within a loop body -- including the
 // main/begin/end statements.  Since there is no containing loop body, there is no need to check
 // for break or continue flags after each statement.
 void mlr_dsl_cst_handle_statement_block(
-	sllv_t*        pcst_statements,
-	variables_t*   pvars,
-	cst_outputs_t* pcst_outputs)
+	cst_statement_block_t* pblock,
+	variables_t*           pvars,
+	cst_outputs_t*         pcst_outputs)
 {
-	for (sllve_t* pe = pcst_statements->phead; pe != NULL; pe = pe->pnext) {
+	// xxx frame ...
+	for (sllve_t* pe = pblock->pstatements->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_cst_statement_t* pstatement = pe->pvvalue;
 		pstatement->pnode_handler(pstatement, pvars, pcst_outputs);
 		// The UDF/subroutine executor will clear the flag, and consume the retval if there is one.
@@ -2091,12 +2138,12 @@ void mlr_dsl_cst_handle_statement_block(
 
 // This is for statement lists recursively contained within a loop body.
 // It checks for break or continue flags after each statement.
-static void handle_statement_list_with_break_continue(
-	sllv_t*        pcst_statements,
+static void handle_statement_block_with_break_continue(
+	cst_statement_block_t* pblock,
 	variables_t*   pvars,
 	cst_outputs_t* pcst_outputs)
 {
-	for (sllve_t* pe = pcst_statements->phead; pe != NULL; pe = pe->pnext) {
+	for (sllve_t* pe = pblock->pstatements->phead; pe != NULL; pe = pe->pnext) {
 		mlr_dsl_cst_statement_t* pstatement = pe->pvvalue;
 		pstatement->pnode_handler(pstatement, pvars, pcst_outputs);
 		if (loop_stack_get(pvars->ploop_stack) != 0) {
@@ -2109,6 +2156,18 @@ static void handle_statement_list_with_break_continue(
 	}
 }
 
+// Triple-for start/continuation/update statement lists
+void mlr_dsl_cst_handle_statement_list(
+	sllv_t*        pstatements,
+	variables_t*   pvars,
+	cst_outputs_t* pcst_outputs)
+{
+	for (sllve_t* pe = pstatements->phead; pe != NULL; pe = pe->pnext) {
+		mlr_dsl_cst_statement_t* pstatement = pe->pvvalue;
+		pstatement->pnode_handler(pstatement, pvars, pcst_outputs);
+	}
+}
+
 // ----------------------------------------------------------------
 static void handle_subr_callsite(
 	mlr_dsl_cst_statement_t* pstatement,
@@ -2483,6 +2542,7 @@ static void handle_conditional_block(
 	variables_t*             pvars,
 	cst_outputs_t*           pcst_outputs)
 {
+	// xxx local entry, here & all bind.stack.push
 	bind_stack_push(pvars->pbind_stack, bind_stack_frame_enter(pstatement->pframe));
 	rval_evaluator_t* prhs_evaluator = pstatement->prhs_evaluator;
 
@@ -2490,7 +2550,7 @@ static void handle_conditional_block(
 	if (mv_is_non_null(&val)) {
 		mv_set_boolean_strict(&val);
 		if (val.u.boolv) {
-			pstatement->pblock_handler(pstatement->pblock_statements, pvars, pcst_outputs);
+			pstatement->pblock_handler(pstatement->pstatement_block, pvars, pcst_outputs);
 		}
 	}
 	bind_stack_frame_exit(bind_stack_pop(pvars->pbind_stack));
@@ -2512,7 +2572,7 @@ static void handle_if_head(
 			if (val.u.boolv) {
 				bind_stack_push(pvars->pbind_stack, bind_stack_frame_enter(pitemnode->pframe));
 
-				pstatement->pblock_handler(pitemnode->pblock_statements, pvars, pcst_outputs);
+				pstatement->pblock_handler(pitemnode->pstatement_block, pvars, pcst_outputs);
 
 				bind_stack_frame_exit(bind_stack_pop(pvars->pbind_stack));
 				break;
@@ -2536,7 +2596,7 @@ static void handle_while(
 		if (mv_is_non_null(&val)) {
 			mv_set_boolean_strict(&val);
 			if (val.u.boolv) {
-				pstatement->pblock_handler(pstatement->pblock_statements, pvars, pcst_outputs);
+				pstatement->pblock_handler(pstatement->pstatement_block, pvars, pcst_outputs);
 				if (loop_stack_get(pvars->ploop_stack) & LOOP_BROKEN) {
 					loop_stack_clear(pvars->ploop_stack, LOOP_BROKEN);
 					break;
@@ -2566,7 +2626,7 @@ static void handle_do_while(
 	rval_evaluator_t* prhs_evaluator = pstatement->prhs_evaluator;
 
 	while (TRUE) {
-		pstatement->pblock_handler(pstatement->pblock_statements, pvars, pcst_outputs);
+		pstatement->pblock_handler(pstatement->pstatement_block, pvars, pcst_outputs);
 		if (loop_stack_get(pvars->ploop_stack) & LOOP_BROKEN) {
 			loop_stack_clear(pvars->ploop_stack, LOOP_BROKEN);
 			break;
@@ -2609,7 +2669,7 @@ static void handle_for_srec(
 		bind_stack_set(pvars->pbind_stack, pstatement->for_srec_k_name, &mvkey, FREE_ENTRY_VALUE);
 		bind_stack_set(pvars->pbind_stack, pstatement->for_v_name, &mvval, FREE_ENTRY_VALUE);
 
-		pstatement->pblock_handler(pstatement->pblock_statements, pvars, pcst_outputs);
+		pstatement->pblock_handler(pstatement->pstatement_block, pvars, pcst_outputs);
 		if (loop_stack_get(pvars->ploop_stack) & LOOP_BROKEN) {
 			loop_stack_clear(pvars->ploop_stack, LOOP_BROKEN);
 			break;
@@ -2649,7 +2709,7 @@ static void handle_for_oosvar(
 			// Recurse over the for-k-names, e.g. ["k1", "k2"], on each call descending one level
 			// deeper into the submap.  Note there must be at least one k-name so we are assuming
 			// the for-loop within handle_for_oosvar_aux was gone through once & thus
-			// handle_statement_list_with_break_continue was called through there.
+			// handle_statement_block_with_break_continue was called through there.
 
 			handle_for_oosvar_aux(pstatement, pvars, pcst_outputs, submap,
 				pstatement->pfor_oosvar_k_names->phead);
@@ -2707,7 +2767,7 @@ static void handle_for_oosvar_aux(
 			// Bind the v-name to the terminal mlrval:
 			bind_stack_set(pvars->pbind_stack, pstatement->for_v_name, &submap.u.mlrval, NO_FREE);
 			// Execute the loop-body statements:
-			pstatement->pblock_handler(pstatement->pblock_statements, pvars, pcst_outputs);
+			pstatement->pblock_handler(pstatement->pstatement_block, pvars, pcst_outputs);
 		}
 
 	}
@@ -2739,7 +2799,7 @@ static void handle_for_oosvar_key_only(
 			bind_stack_set(pvars->pbind_stack, pstatement->pfor_oosvar_k_names->phead->value, pe->pvvalue, NO_FREE);
 
 			// Execute the loop-body statements:
-			pstatement->pblock_handler(pstatement->pblock_statements, pvars, pcst_outputs);
+			pstatement->pblock_handler(pstatement->pstatement_block, pvars, pcst_outputs);
 
 			if (loop_stack_get(pvars->ploop_stack) & LOOP_BROKEN) {
 				loop_stack_clear(pvars->ploop_stack, LOOP_BROKEN);
@@ -2768,11 +2828,12 @@ static void handle_triple_for(
 	loop_stack_push(pvars->ploop_stack);
 
 	// Start statements
-	mlr_dsl_cst_handle_statement_block(pstatement->ptriple_for_start_statements, pvars, pcst_outputs);
+	mlr_dsl_cst_handle_statement_list(pstatement->ptriple_for_start_statements, pvars, pcst_outputs);
 
 	while (TRUE) {
 
 		// Continuation statement
+		// xxx the rest -- ?!?
 		rval_evaluator_t* pev = pstatement->ptriple_for_continuation_evaluator;
 		mv_t val = pev->pprocess_func(pev->pvstate, pvars);
 		if (mv_is_non_null(&val))
@@ -2781,7 +2842,7 @@ static void handle_triple_for(
 			break;
 
 		// Body statements
-		handle_statement_list_with_break_continue(pstatement->pblock_statements, pvars, pcst_outputs);
+		handle_statement_block_with_break_continue(pstatement->pstatement_block, pvars, pcst_outputs);
 
 		if (loop_stack_get(pvars->ploop_stack) & LOOP_BROKEN) {
 			loop_stack_clear(pvars->ploop_stack, LOOP_BROKEN);
@@ -2791,7 +2852,7 @@ static void handle_triple_for(
 		}
 
 		// Update statements
-		mlr_dsl_cst_handle_statement_block(pstatement->ptriple_for_update_statements, pvars, pcst_outputs);
+		mlr_dsl_cst_handle_statement_list(pstatement->ptriple_for_update_statements, pvars, pcst_outputs);
 	}
 
 	loop_stack_pop(pvars->ploop_stack);
@@ -3273,5 +3334,3 @@ static void handle_print(
 		free(sval);
 	mv_free(&val);
 }
-
-// xxx split out mlr_dsl_cst_statements.c ?
diff --git a/c/mapping/mlr_dsl_stack_allocate.c b/c/mapping/mlr_dsl_stack_allocate.c
index efa30077e..2686f544b 100644
--- a/c/mapping/mlr_dsl_stack_allocate.c
+++ b/c/mapping/mlr_dsl_stack_allocate.c
@@ -146,6 +146,7 @@ static void pass_1_for_func_subr_block(mlr_dsl_ast_node_t* pnode, int trace);
 static void pass_1_for_begin_end_block(mlr_dsl_ast_node_t* pnode, int trace);
 static void pass_1_for_main_block(mlr_dsl_ast_node_t* pnode, int trace);
 static void pass_1_for_statement_block(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pframe_group, int trace);
+static void pass_1_for_statement_list(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pframe_group, int trace);
 static void pass_1_for_node(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pframe_group, int trace);
 
 // Pass-2 helper methods for the main entry point to this file.
@@ -284,6 +285,7 @@ static void pass_1_for_main_block(mlr_dsl_ast_node_t* pnode, int trace) {
 }
 
 // ----------------------------------------------------------------
+// Curly-bracked bodies of if/while/for/etc.
 static void pass_1_for_statement_block(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pframe_group, int trace) {
 	if (pnode->type != MD_AST_NODE_TYPE_STATEMENT_BLOCK) {
 		fprintf(stderr,
@@ -297,6 +299,20 @@ static void pass_1_for_statement_block(mlr_dsl_ast_node_t* pnode, stkalc_frame_g
 	}
 }
 
+// Non-curly-braced triple-for starts/continuations/updates statement lists.
+static void pass_1_for_statement_list(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pframe_group, int trace) {
+	if (pnode->type != MD_AST_NODE_TYPE_STATEMENT_LIST) {
+		fprintf(stderr,
+			"%s: internal coding error detected in file %s at line %d.\n",
+			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
+		exit(1);
+	}
+	for (sllve_t* pe = pnode->pchildren->phead; pe != NULL; pe = pe->pnext) {
+		mlr_dsl_ast_node_t* pchild = pe->pvvalue;
+		pass_1_for_node(pchild, pframe_group, trace);
+	}
+}
+
 // ----------------------------------------------------------------
 static void pass_1_for_node(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pframe_group, int trace) {
 
@@ -377,6 +393,7 @@ static void pass_1_for_node(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pfr
 		}
 
 	} else if (pnode->type == MD_AST_NODE_TYPE_FOR_OOSVAR) { // xxx comment
+		// xxx funcify all these
 
 		mlr_dsl_ast_node_t* pvarsnode    = pnode->pchildren->phead->pvvalue;
 		mlr_dsl_ast_node_t* pkeylistnode = pnode->pchildren->phead->pnext->pvvalue;
@@ -413,6 +430,32 @@ static void pass_1_for_node(mlr_dsl_ast_node_t* pnode, stkalc_frame_group_t* pfr
 			printf("POP FRAME %s frct=%d\n", pnode->text, pnode->frame_var_count);
 		}
 
+	} else if (pnode->type == MD_AST_NODE_TYPE_TRIPLE_FOR) { // xxx comment
+		mlr_dsl_ast_node_t* pstarts_node        = pnode->pchildren->phead->pvvalue;
+		mlr_dsl_ast_node_t* pcontinuations_node = pnode->pchildren->phead->pnext->pvvalue;
+		mlr_dsl_ast_node_t* pupdates_node       = pnode->pchildren->phead->pnext->pnext->pvvalue;
+		mlr_dsl_ast_node_t* pblock_node         = pnode->pchildren->phead->pnext->pnext->pnext->pvvalue;
+
+		if (trace) {
+			leader_print(pframe_group->plist->length);
+			printf("PUSH FRAME %s\n", pnode->text);
+		}
+		stkalc_frame_t* pnext_frame = stkalc_frame_alloc();
+		stkalc_frame_group_push(pframe_group, pnext_frame);
+
+		pass_1_for_statement_list(pstarts_node, pframe_group, trace);
+		pass_1_for_statement_list(pcontinuations_node, pframe_group, trace);
+		pass_1_for_statement_list(pupdates_node, pframe_group, trace);
+		pass_1_for_statement_block(pblock_node, pframe_group, trace);
+
+		pnode->frame_var_count = pnext_frame->var_count;
+
+		stkalc_frame_free(stkalc_frame_group_pop(pframe_group));
+		if (trace) {
+			leader_print(pframe_group->plist->length);
+			printf("POP FRAME %s frct=%d\n", pnode->text, pnode->frame_var_count);
+		}
+
 	} else if (pnode->pchildren != NULL) {
 		for (sllve_t* pe = pnode->pchildren->phead; pe != NULL; pe = pe->pnext) {
 			mlr_dsl_ast_node_t* pchild = pe->pvvalue;
diff --git a/c/reg_test/expected/out b/c/reg_test/expected/out
index 4fc7c9090..1b29d2271 100644
--- a/c/reg_test/expected/out
+++ b/c/reg_test/expected/out
@@ -9352,7 +9352,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -9376,7 +9376,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="||", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9400,7 +9400,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^^", type=OPERATOR:
@@ -9424,7 +9424,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^^", type=OPERATOR:
         text="^^", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9448,7 +9448,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="&&", type=OPERATOR:
@@ -9472,7 +9472,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&&", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9496,7 +9496,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="==", type=OPERATOR:
@@ -9520,7 +9520,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="==", type=OPERATOR:
         text="==", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9544,7 +9544,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="!=", type=OPERATOR:
@@ -9568,7 +9568,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="!=", type=OPERATOR:
         text="!=", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9592,7 +9592,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="=~", type=OPERATOR:
@@ -9616,7 +9616,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="=~", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9640,7 +9640,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="!=~", type=OPERATOR:
@@ -9664,7 +9664,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="!=~", type=OPERATOR:
         text="!=~", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9688,7 +9688,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="!=", type=OPERATOR:
@@ -9712,7 +9712,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="!=", type=OPERATOR:
         text="==", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9736,7 +9736,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="==", type=OPERATOR:
@@ -9760,7 +9760,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="==", type=OPERATOR:
         text="!=", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9784,7 +9784,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<", type=OPERATOR:
@@ -9808,7 +9808,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<", type=OPERATOR:
         text="<", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9832,7 +9832,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<=", type=OPERATOR:
@@ -9856,7 +9856,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<=", type=OPERATOR:
         text="<=", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9880,7 +9880,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text=">", type=OPERATOR:
@@ -9904,7 +9904,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text=">", type=OPERATOR:
         text=">", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9928,7 +9928,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text=">=", type=OPERATOR:
@@ -9952,7 +9952,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text=">=", type=OPERATOR:
         text=">=", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -9976,7 +9976,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<=", type=OPERATOR:
@@ -10000,7 +10000,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<=", type=OPERATOR:
         text="<", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10024,7 +10024,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<", type=OPERATOR:
@@ -10048,7 +10048,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<", type=OPERATOR:
         text="<=", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10072,7 +10072,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -10096,7 +10096,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="|", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10120,7 +10120,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^", type=OPERATOR:
@@ -10144,7 +10144,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^", type=OPERATOR:
         text="^", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10168,7 +10168,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="&", type=OPERATOR:
@@ -10192,7 +10192,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&", type=OPERATOR:
         text="&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10216,7 +10216,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -10240,7 +10240,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&", type=OPERATOR:
@@ -10264,7 +10264,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -10288,7 +10288,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="^", type=OPERATOR:
@@ -10312,7 +10312,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -10336,7 +10336,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="^", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10360,7 +10360,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^", type=OPERATOR:
@@ -10384,7 +10384,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&", type=OPERATOR:
@@ -10408,7 +10408,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -10432,7 +10432,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10456,7 +10456,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^", type=OPERATOR:
@@ -10480,7 +10480,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^", type=OPERATOR:
         text="&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10504,7 +10504,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<<", type=OPERATOR:
@@ -10528,7 +10528,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<<", type=OPERATOR:
         text="<<", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10552,7 +10552,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text=">>", type=OPERATOR:
@@ -10576,7 +10576,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text=">>", type=OPERATOR:
         text=">>", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10600,7 +10600,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text=">>", type=OPERATOR:
@@ -10624,7 +10624,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text=">>", type=OPERATOR:
         text="<<", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10648,7 +10648,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<<", type=OPERATOR:
@@ -10672,7 +10672,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<<", type=OPERATOR:
         text=">>", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10696,7 +10696,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -10720,7 +10720,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="+", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10744,7 +10744,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="-", type=OPERATOR:
@@ -10768,7 +10768,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="-", type=OPERATOR:
         text="-", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10792,7 +10792,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="-", type=OPERATOR:
@@ -10816,7 +10816,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="-", type=OPERATOR:
         text="+", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10840,7 +10840,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -10864,7 +10864,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="-", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10888,7 +10888,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text=".", type=OPERATOR:
@@ -10912,7 +10912,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text=".", type=OPERATOR:
         text=".", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10936,7 +10936,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -10960,7 +10960,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -10984,7 +10984,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -11008,7 +11008,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="/", type=OPERATOR:
         text="/", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11032,7 +11032,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -11056,7 +11056,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="//", type=OPERATOR:
         text="//", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11080,7 +11080,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -11104,7 +11104,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="%", type=OPERATOR:
         text="%", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11128,7 +11128,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="**", type=OPERATOR:
@@ -11152,7 +11152,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="**", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -11176,7 +11176,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -11200,7 +11200,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="/", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11224,7 +11224,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -11248,7 +11248,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="//", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11272,7 +11272,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -11296,7 +11296,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="%", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11320,7 +11320,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -11344,7 +11344,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -11368,7 +11368,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -11392,7 +11392,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="/", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11416,7 +11416,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -11440,7 +11440,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="//", type=OPERATOR:
         text="/", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11464,7 +11464,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -11488,7 +11488,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="%", type=OPERATOR:
         text="/", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11512,7 +11512,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -11536,7 +11536,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="/", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -11560,7 +11560,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -11584,7 +11584,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="//", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11608,7 +11608,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -11632,7 +11632,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="/", type=OPERATOR:
         text="//", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11656,7 +11656,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -11680,7 +11680,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="%", type=OPERATOR:
         text="//", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11704,7 +11704,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -11728,7 +11728,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="//", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -11752,7 +11752,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -11776,7 +11776,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="%", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11800,7 +11800,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -11824,7 +11824,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="/", type=OPERATOR:
         text="%", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11848,7 +11848,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -11872,7 +11872,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="//", type=OPERATOR:
         text="%", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11896,7 +11896,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -11920,7 +11920,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="%", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -11944,7 +11944,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -11968,7 +11968,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -11992,7 +11992,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -12016,7 +12016,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="/", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12040,7 +12040,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -12064,7 +12064,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="//", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12088,7 +12088,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -12112,7 +12112,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="%", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12134,7 +12134,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -12154,7 +12154,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="+", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12174,7 +12174,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="-", type=OPERATOR:
@@ -12194,7 +12194,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="-", type=OPERATOR:
         text="-", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12214,7 +12214,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="!", type=OPERATOR:
@@ -12234,7 +12234,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="!", type=OPERATOR:
         text="!", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12254,7 +12254,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="~", type=OPERATOR:
@@ -12274,7 +12274,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="~", type=OPERATOR:
         text="~", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12295,7 +12295,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="? :", type=OPERATOR:
@@ -12317,7 +12317,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="? :", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="2", type=STRNUM_LITERAL.
@@ -12342,7 +12342,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="? :", type=OPERATOR:
@@ -12370,7 +12370,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="? :", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="? :", type=OPERATOR:
@@ -12398,7 +12398,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="? :", type=OPERATOR:
@@ -12426,7 +12426,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="? :", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="2", type=STRNUM_LITERAL.
@@ -12456,7 +12456,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -12480,7 +12480,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="^^", type=OPERATOR:
@@ -12504,7 +12504,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -12528,7 +12528,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&&", type=OPERATOR:
@@ -12552,7 +12552,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -12576,7 +12576,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="^^", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12600,7 +12600,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^^", type=OPERATOR:
@@ -12624,7 +12624,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^^", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&&", type=OPERATOR:
@@ -12648,7 +12648,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -12672,7 +12672,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12696,7 +12696,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^^", type=OPERATOR:
@@ -12720,7 +12720,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^^", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12744,7 +12744,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="==", type=OPERATOR:
@@ -12768,7 +12768,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="==", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="<=", type=OPERATOR:
@@ -12792,7 +12792,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="==", type=OPERATOR:
@@ -12816,7 +12816,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="==", type=OPERATOR:
         text="<=", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12840,7 +12840,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<=", type=OPERATOR:
@@ -12864,7 +12864,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<=", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="|", type=OPERATOR:
@@ -12888,7 +12888,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="<=", type=OPERATOR:
@@ -12912,7 +12912,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="<=", type=OPERATOR:
         text="|", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -12936,7 +12936,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -12960,7 +12960,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="^", type=OPERATOR:
@@ -12984,7 +12984,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -13008,7 +13008,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="^", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13032,7 +13032,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^", type=OPERATOR:
@@ -13056,7 +13056,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&", type=OPERATOR:
@@ -13080,7 +13080,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="^", type=OPERATOR:
@@ -13104,7 +13104,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="^", type=OPERATOR:
         text="&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13128,7 +13128,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="&", type=OPERATOR:
@@ -13152,7 +13152,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="<<", type=OPERATOR:
@@ -13176,7 +13176,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="&", type=OPERATOR:
@@ -13200,7 +13200,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&", type=OPERATOR:
         text="<<", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13224,7 +13224,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13248,7 +13248,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="*", type=OPERATOR:
@@ -13272,7 +13272,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13296,7 +13296,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13320,7 +13320,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13344,7 +13344,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="*", type=OPERATOR:
@@ -13368,7 +13368,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -13392,7 +13392,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="+", type=OPERATOR:
@@ -13416,7 +13416,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -13440,7 +13440,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="+", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13464,7 +13464,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13488,7 +13488,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13512,7 +13512,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13536,7 +13536,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -13560,7 +13560,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13584,7 +13584,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13608,7 +13608,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13632,7 +13632,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -13656,7 +13656,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="**", type=OPERATOR:
@@ -13680,7 +13680,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="**", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="+", type=OPERATOR:
@@ -13704,7 +13704,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="**", type=OPERATOR:
@@ -13728,7 +13728,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="**", type=OPERATOR:
         text="+", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13752,7 +13752,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -13776,7 +13776,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13800,7 +13800,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -13824,7 +13824,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -13848,7 +13848,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -13872,7 +13872,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -13896,7 +13896,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -13920,7 +13920,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="**", type=OPERATOR:
@@ -13944,7 +13944,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="**", type=OPERATOR:
@@ -13968,7 +13968,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="**", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="*", type=OPERATOR:
@@ -13992,7 +13992,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="**", type=OPERATOR:
@@ -14016,7 +14016,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="**", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14040,7 +14040,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -14064,7 +14064,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="*", type=OPERATOR:
         text="**", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14089,7 +14089,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -14115,7 +14115,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="-", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14141,7 +14141,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -14167,7 +14167,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="*", type=OPERATOR:
             text="-", type=OPERATOR:
@@ -14193,7 +14193,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -14219,7 +14219,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="*", type=OPERATOR:
@@ -14245,7 +14245,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -14271,7 +14271,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14297,7 +14297,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -14323,7 +14323,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="*", type=OPERATOR:
@@ -14349,7 +14349,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -14375,7 +14375,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="+", type=OPERATOR:
         text="*", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14401,7 +14401,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -14427,7 +14427,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="~", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14453,7 +14453,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -14479,7 +14479,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="&", type=OPERATOR:
             text="~", type=OPERATOR:
@@ -14505,7 +14505,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -14531,7 +14531,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&", type=OPERATOR:
@@ -14557,7 +14557,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -14583,7 +14583,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14609,7 +14609,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -14635,7 +14635,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="1", type=STRNUM_LITERAL.
         text="&", type=OPERATOR:
@@ -14661,7 +14661,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -14687,7 +14687,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="|", type=OPERATOR:
         text="&", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -14718,7 +14718,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="&&", type=OPERATOR:
@@ -14754,7 +14754,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&&", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="==", type=OPERATOR:
@@ -14790,7 +14790,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -14826,7 +14826,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="==", type=OPERATOR:
             text="a", type=FIELD_NAME.
@@ -14862,7 +14862,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -14898,7 +14898,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="||", type=OPERATOR:
             text="==", type=OPERATOR:
@@ -14934,7 +14934,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -14970,7 +14970,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="==", type=OPERATOR:
@@ -15005,7 +15005,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="? :", type=OPERATOR:
@@ -15039,7 +15039,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="? :", type=OPERATOR:
         text="==", type=OPERATOR:
             text="a", type=FIELD_NAME.
@@ -15064,7 +15064,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="true", type=BOOLEAN_LITERAL.
@@ -15080,7 +15080,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="true", type=BOOLEAN_LITERAL.
 
 
@@ -15101,7 +15101,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="true", type=BOOLEAN_LITERAL.
         text="==", type=OPERATOR:
@@ -15126,7 +15126,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="true", type=BOOLEAN_LITERAL.
         text="==", type=OPERATOR:
@@ -15151,7 +15151,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="==", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -15176,7 +15176,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="||", type=OPERATOR:
         text="==", type=OPERATOR:
             text="1", type=STRNUM_LITERAL.
@@ -15199,7 +15199,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&&", type=OPERATOR:
         text="true", type=BOOLEAN_LITERAL.
         text="false", type=BOOLEAN_LITERAL.
@@ -15220,7 +15220,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&&", type=OPERATOR:
         text="true", type=BOOLEAN_LITERAL.
         text="false", type=BOOLEAN_LITERAL.
@@ -15243,7 +15243,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&&", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="true", type=BOOLEAN_LITERAL.
@@ -15268,7 +15268,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="&&", type=OPERATOR:
         text="&&", type=OPERATOR:
             text="true", type=BOOLEAN_LITERAL.
@@ -15292,7 +15292,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -15318,7 +15318,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -15342,7 +15342,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="||", type=OPERATOR:
@@ -15364,7 +15364,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="^^", type=OPERATOR:
@@ -15386,7 +15386,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="&&", type=OPERATOR:
@@ -15408,7 +15408,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="|", type=OPERATOR:
@@ -15430,7 +15430,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="^", type=OPERATOR:
@@ -15452,7 +15452,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="&", type=OPERATOR:
@@ -15474,7 +15474,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="<<", type=OPERATOR:
@@ -15496,7 +15496,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text=">>", type=OPERATOR:
@@ -15518,7 +15518,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="+", type=OPERATOR:
@@ -15540,7 +15540,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="-", type=OPERATOR:
@@ -15562,7 +15562,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text=".", type=OPERATOR:
@@ -15584,7 +15584,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="*", type=OPERATOR:
@@ -15606,7 +15606,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -15628,7 +15628,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="//", type=OPERATOR:
@@ -15650,7 +15650,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="%", type=OPERATOR:
@@ -15672,7 +15672,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="y", type=FIELD_NAME.
         text="**", type=OPERATOR:
@@ -15721,7 +15721,7 @@ AST ROOT:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n filter -v 
@@ -15742,11 +15742,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {;}
@@ -15760,11 +15760,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {;;}
@@ -15778,11 +15778,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {;;;}
@@ -15796,11 +15796,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {@x=1}
@@ -15818,7 +15818,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -15826,7 +15826,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {@x=1;}
@@ -15844,7 +15844,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -15852,7 +15852,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {;@x=1}
@@ -15870,7 +15870,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -15878,7 +15878,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {@x=1;@y=2}
@@ -15900,7 +15900,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -15912,7 +15912,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="2", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v begin {@x=1;;@y=2}
@@ -15934,7 +15934,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -15946,7 +15946,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="2", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v true {}
@@ -15961,10 +15961,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
 
 
 mlr -n put -v true {;}
@@ -15979,10 +15979,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
 
 
 mlr -n put -v true {;;}
@@ -15997,10 +15997,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
 
 
 mlr -n put -v true {;;;}
@@ -16015,10 +16015,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
 
 
 mlr -n put -v true {@x=1}
@@ -16037,10 +16037,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="x", type=STRING_LITERAL.
@@ -16063,10 +16063,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="x", type=STRING_LITERAL.
@@ -16089,10 +16089,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="x", type=STRING_LITERAL.
@@ -16119,10 +16119,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="x", type=STRING_LITERAL.
@@ -16153,10 +16153,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="x", type=STRING_LITERAL.
@@ -16178,11 +16178,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {;}
@@ -16196,11 +16196,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {;;}
@@ -16214,11 +16214,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {;;;}
@@ -16232,11 +16232,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {@x=1}
@@ -16254,7 +16254,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16262,7 +16262,7 @@ text="end", type=END: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {@x=1;}
@@ -16280,7 +16280,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16288,7 +16288,7 @@ text="end", type=END: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {;@x=1}
@@ -16306,7 +16306,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16314,7 +16314,7 @@ text="end", type=END: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {@x=1;@y=2}
@@ -16336,7 +16336,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16348,7 +16348,7 @@ text="end", type=END: frct=1 maxct=1
             text="2", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr -n put -v end {@x=1;;@y=2}
@@ -16370,7 +16370,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16382,7 +16382,7 @@ text="end", type=END: frct=1 maxct=1
             text="2", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 
@@ -16409,10 +16409,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="begin", type=BEGIN:
-            text="begin_block", type=STATEMENT_BLOCK: frct=0
+            text="begin_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=OOSVAR_ASSIGNMENT:
                     text="oosvar_keylist", type=OOSVAR_KEYLIST:
                         text="x", type=STRING_LITERAL.
@@ -16437,12 +16437,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="begin", type=BEGIN:
-                text="begin_block", type=STATEMENT_BLOCK: frct=0
+                text="begin_block", type=STATEMENT_BLOCK: frame_var_count=0
                     text="=", type=OOSVAR_ASSIGNMENT:
                         text="oosvar_keylist", type=OOSVAR_KEYLIST:
                             text="x", type=STRING_LITERAL.
@@ -16466,10 +16466,10 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="end", type=END:
-            text="end_block", type=STATEMENT_BLOCK: frct=0
+            text="end_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=OOSVAR_ASSIGNMENT:
                     text="oosvar_keylist", type=OOSVAR_KEYLIST:
                         text="x", type=STRING_LITERAL.
@@ -16494,12 +16494,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="end", type=END:
-                text="end_block", type=STATEMENT_BLOCK: frct=0
+                text="end_block", type=STATEMENT_BLOCK: frame_var_count=0
                     text="=", type=OOSVAR_ASSIGNMENT:
                         text="oosvar_keylist", type=OOSVAR_KEYLIST:
                             text="x", type=STRING_LITERAL.
@@ -16522,7 +16522,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=SREC_ASSIGNMENT:
             text="x", type=FIELD_NAME.
@@ -16544,7 +16544,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16566,7 +16566,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=SREC_ASSIGNMENT:
             text="x", type=FIELD_NAME.
@@ -16588,7 +16588,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -16609,7 +16609,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="unset", type=UNSET:
             text="x", type=FIELD_NAME.
@@ -16628,7 +16628,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="unset", type=UNSET:
             text="x", type=FIELD_NAME.
@@ -16647,7 +16647,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="unset", type=UNSET:
             text="$*", type=FULL_SREC.
@@ -16666,7 +16666,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="unset", type=UNSET:
             text="$*", type=FULL_SREC.
@@ -16684,7 +16684,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="break", type=BREAK.
 
 mlr put -v continue
@@ -16698,7 +16698,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="continue", type=CONTINUE.
 
 
@@ -16714,7 +16714,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="break", type=BREAK.
 
 mlr filter -v continue
@@ -16728,7 +16728,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="continue", type=CONTINUE.
 
 
@@ -20486,7 +20486,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="bcd", type=STRNUM_LITERAL.
@@ -20506,7 +20506,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^bcd", type=STRNUM_LITERAL.
@@ -20524,7 +20524,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^abc", type=STRNUM_LITERAL.
@@ -20545,7 +20545,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^abc$", type=STRNUM_LITERAL.
@@ -20564,7 +20564,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^a.*d$", type=STRNUM_LITERAL.
@@ -20585,7 +20585,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text=".", type=OPERATOR:
@@ -20606,7 +20606,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="y", type=FIELD_NAME.
         text=""..", type=STRNUM_LITERAL.
@@ -20625,7 +20625,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="bcd", type=REGEXI.
@@ -20648,7 +20648,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^bcd", type=REGEXI.
@@ -20666,7 +20666,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^abc", type=REGEXI.
@@ -20691,7 +20691,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^abc$", type=REGEXI.
@@ -20711,7 +20711,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text="^a.*d$", type=REGEXI.
@@ -20733,7 +20733,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=~", type=OPERATOR:
         text="x", type=FIELD_NAME.
         text=".", type=OPERATOR:
@@ -22788,7 +22788,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -22796,7 +22796,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="d", type=FIELD_NAME.
         text="-", type=OPERATOR:
@@ -22851,7 +22851,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -22859,7 +22859,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="no", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="d", type=FIELD_NAME.
         text="? :", type=OPERATOR:
@@ -22908,7 +22908,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="d", type=FIELD_NAME.
         text="/", type=OPERATOR:
@@ -22963,7 +22963,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -22971,7 +22971,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="no", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="d", type=FIELD_NAME.
         text="? :", type=OPERATOR:
@@ -23027,7 +23027,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23035,7 +23035,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="rsum", type=STRING_LITERAL.
@@ -23119,7 +23119,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23135,7 +23135,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="za", type=FIELD_NAME.
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23244,7 +23244,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23260,7 +23260,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="za", type=FIELD_NAME.
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23335,7 +23335,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23343,7 +23343,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="d", type=FIELD_NAME.
         text="-", type=OPERATOR:
@@ -23405,7 +23405,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="emitf", type=EMITF:
             text="emitf", type=EMITF:
@@ -23424,7 +23424,7 @@ text="end", type=END: frct=1 maxct=1
             text="stream", type=STREAM:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="a", type=STRING_LITERAL.
@@ -23484,7 +23484,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="emitf", type=EMITF:
             text="emitf", type=EMITF:
@@ -23497,7 +23497,7 @@ text="end", type=END: frct=1 maxct=1
             text="stream", type=STREAM:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="a", type=STRING_LITERAL.
@@ -23571,7 +23571,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23583,7 +23583,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0.0", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23600,7 +23600,7 @@ text="end", type=END: frct=1 maxct=1
             text="stream", type=STREAM:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="count", type=STRING_LITERAL.
@@ -23679,7 +23679,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23691,7 +23691,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="0.0", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23708,7 +23708,7 @@ text="end", type=END: frct=1 maxct=1
             text="stream", type=STREAM:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="count", type=STRING_LITERAL.
@@ -23780,7 +23780,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23790,7 +23790,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
                 text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -23803,7 +23803,7 @@ text="end", type=END: frct=1 maxct=1
             text="6", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="c", type=FIELD_NAME.
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24350,7 +24350,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24358,7 +24358,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24366,7 +24366,7 @@ text="end", type=END: frct=1 maxct=1
             text="9", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="e", type=FIELD_NAME.
         text="2", type=STRNUM_LITERAL.
@@ -24378,7 +24378,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="h", type=FIELD_NAME.
                 text="i", type=FIELD_NAME.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
     text="=", type=SREC_ASSIGNMENT:
         text="x", type=FIELD_NAME.
         text="6", type=STRNUM_LITERAL.
@@ -24423,7 +24423,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24431,7 +24431,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24439,7 +24439,7 @@ text="end", type=END: frct=1 maxct=1
             text="9", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="e", type=FIELD_NAME.
         text="2", type=STRNUM_LITERAL.
@@ -24451,7 +24451,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="h", type=FIELD_NAME.
                 text="i", type=FIELD_NAME.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=SREC_ASSIGNMENT:
                 text="s", type=FIELD_NAME.
                 text="1", type=STRNUM_LITERAL.
@@ -24502,7 +24502,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24510,7 +24510,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24518,7 +24518,7 @@ text="end", type=END: frct=1 maxct=1
             text="9", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="e", type=FIELD_NAME.
         text="2", type=STRNUM_LITERAL.
@@ -24530,7 +24530,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="h", type=FIELD_NAME.
                 text="i", type=FIELD_NAME.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=SREC_ASSIGNMENT:
                 text="s", type=FIELD_NAME.
                 text="1", type=STRNUM_LITERAL.
@@ -24587,7 +24587,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24595,7 +24595,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24603,7 +24603,7 @@ text="end", type=END: frct=1 maxct=1
             text="9", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="e", type=FIELD_NAME.
         text="2", type=STRNUM_LITERAL.
@@ -24615,7 +24615,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="h", type=FIELD_NAME.
                 text="i", type=FIELD_NAME.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=SREC_ASSIGNMENT:
                 text="s", type=FIELD_NAME.
                 text="1", type=STRNUM_LITERAL.
@@ -24686,7 +24686,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24694,7 +24694,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
             text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -24702,7 +24702,7 @@ text="end", type=END: frct=1 maxct=1
             text="9", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=SREC_ASSIGNMENT:
         text="e", type=FIELD_NAME.
         text="2", type=STRNUM_LITERAL.
@@ -24714,7 +24714,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="h", type=FIELD_NAME.
                 text="i", type=FIELD_NAME.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=SREC_ASSIGNMENT:
                 text="s", type=FIELD_NAME.
                 text="1", type=STRNUM_LITERAL.
@@ -24774,32 +24774,32 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="cond", type=CONDITIONAL_BLOCK:
             text="true", type=BOOLEAN_LITERAL.
-            text="cond_block", type=STATEMENT_BLOCK: frct=0
+            text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=OOSVAR_ASSIGNMENT:
                     text="oosvar_keylist", type=OOSVAR_KEYLIST:
                         text="x", type=STRING_LITERAL.
                     text="1", type=STRNUM_LITERAL.
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="cond", type=CONDITIONAL_BLOCK:
             text="true", type=BOOLEAN_LITERAL.
-            text="cond_block", type=STATEMENT_BLOCK: frct=0
+            text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=OOSVAR_ASSIGNMENT:
                     text="oosvar_keylist", type=OOSVAR_KEYLIST:
                         text="x", type=STRING_LITERAL.
                     text="3", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="true", type=BOOLEAN_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="x", type=STRING_LITERAL.
@@ -24837,13 +24837,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="1", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="2", type=STRNUM_LITERAL.
@@ -24928,13 +24928,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="4", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="5", type=STRNUM_LITERAL.
@@ -24942,7 +24942,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
                     text="y", type=FIELD_NAME.
                     text="6", type=STRNUM_LITERAL.
         text="else", type=IF_ITEM:
-            text="else_block", type=STATEMENT_BLOCK: frct=0
+            text="else_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="1007", type=STRNUM_LITERAL.
@@ -25041,13 +25041,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="9", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="10", type=STRNUM_LITERAL.
@@ -25058,7 +25058,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="12", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="13", type=STRNUM_LITERAL.
@@ -25066,7 +25066,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
                     text="y", type=FIELD_NAME.
                     text="14", type=STRNUM_LITERAL.
         text="else", type=IF_ITEM:
-            text="else_block", type=STATEMENT_BLOCK: frct=0
+            text="else_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="1015", type=STRNUM_LITERAL.
@@ -25179,13 +25179,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="17", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="18", type=STRNUM_LITERAL.
@@ -25196,7 +25196,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="20", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="21", type=STRNUM_LITERAL.
@@ -25207,7 +25207,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="23", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="24", type=STRNUM_LITERAL.
@@ -25215,7 +25215,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
                     text="y", type=FIELD_NAME.
                     text="25", type=STRNUM_LITERAL.
         text="else", type=IF_ITEM:
-            text="else_block", type=STATEMENT_BLOCK: frct=0
+            text="else_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="1026", type=STRNUM_LITERAL.
@@ -25342,13 +25342,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="28", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="29", type=STRNUM_LITERAL.
@@ -25359,7 +25359,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="31", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="32", type=STRNUM_LITERAL.
@@ -25370,7 +25370,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="34", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="35", type=STRNUM_LITERAL.
@@ -25381,7 +25381,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="37", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="38", type=STRNUM_LITERAL.
@@ -25389,7 +25389,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
                     text="y", type=FIELD_NAME.
                     text="39", type=STRNUM_LITERAL.
         text="else", type=IF_ITEM:
-            text="else_block", type=STATEMENT_BLOCK: frct=0
+            text="else_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="1040", type=STRNUM_LITERAL.
@@ -25465,13 +25465,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="1", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="2", type=STRNUM_LITERAL.
@@ -25559,13 +25559,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="4", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="5", type=STRNUM_LITERAL.
@@ -25576,7 +25576,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="7", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="8", type=STRNUM_LITERAL.
@@ -25678,13 +25678,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="10", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="11", type=STRNUM_LITERAL.
@@ -25695,7 +25695,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="13", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="14", type=STRNUM_LITERAL.
@@ -25706,7 +25706,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="16", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="17", type=STRNUM_LITERAL.
@@ -25822,13 +25822,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="if_head", type=IF_HEAD:
         text="if", type=IF_ITEM:
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="19", type=STRNUM_LITERAL.
-            text="if_block", type=STATEMENT_BLOCK: frct=0
+            text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="20", type=STRNUM_LITERAL.
@@ -25839,7 +25839,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="22", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="23", type=STRNUM_LITERAL.
@@ -25850,7 +25850,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="25", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="26", type=STRNUM_LITERAL.
@@ -25861,7 +25861,7 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
             text="==", type=OPERATOR:
                 text="NR", type=CONTEXT_VARIABLE.
                 text="28", type=STRNUM_LITERAL.
-            text="elif_block", type=STATEMENT_BLOCK: frct=0
+            text="elif_block", type=STATEMENT_BLOCK: frame_var_count=0
                 text="=", type=SREC_ASSIGNMENT:
                     text="x", type=FIELD_NAME.
                     text="29", type=STRNUM_LITERAL.
@@ -25933,7 +25933,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=INDIRECT_SREC_ASSIGNMENT:
         text="a", type=STRNUM_LITERAL.
         text="indirect_field_name", type=INDIRECT_FIELD_NAME:
@@ -25998,7 +25998,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="s", type=STRING_LITERAL.
@@ -26052,7 +26052,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="t", type=STRING_LITERAL.
@@ -26112,7 +26112,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="t", type=STRING_LITERAL.
@@ -26166,7 +26166,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="s", type=STRNUM_LITERAL.
@@ -26215,7 +26215,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="t", type=STRNUM_LITERAL.
@@ -26270,12 +26270,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="while", type=WHILE:
         text="<", type=OPERATOR:
             text="i", type=FIELD_NAME.
             text="5", type=STRNUM_LITERAL.
-        text="while_block", type=STATEMENT_BLOCK: frct=0
+        text="while_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=SREC_ASSIGNMENT:
                 text="i", type=FIELD_NAME.
                 text="+", type=OPERATOR:
@@ -26312,9 +26312,9 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="do", type=DO_WHILE:
-        text="do_while_block", type=STATEMENT_BLOCK: frct=0
+        text="do_while_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=SREC_ASSIGNMENT:
                 text="i", type=FIELD_NAME.
                 text="+", type=OPERATOR:
@@ -26355,11 +26355,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_SREC: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
 
 a=pan,b=pan,i=1,x=0.3467901443380824,y=0.7268028627434533
@@ -26392,11 +26392,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_SREC: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="=", type=SREC_ASSIGNMENT:
                 text="nr", type=FIELD_NAME.
@@ -26435,15 +26435,15 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_SREC: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="unset", type=UNSET:
                 text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-                    text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                    text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
     text="=", type=SREC_ASSIGNMENT:
         text="j", type=FIELD_NAME.
         text="NR", type=CONTEXT_VARIABLE.
@@ -26485,21 +26485,21 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_SREC: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="if_head", type=IF_HEAD:
                 text="if", type=IF_ITEM:
                     text="!=", type=OPERATOR:
-                        text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                        text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
                         text="x", type=STRNUM_LITERAL.
-                    text="if_block", type=STATEMENT_BLOCK: frct=0
+                    text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                         text="unset", type=UNSET:
                             text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-                                text="k", type=LOCAL_VARIABLE. fridx=0 gridx=1 absidx=3
+                                text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=1 absolute_index=3
     text="=", type=SREC_ASSIGNMENT:
         text="j", type=FIELD_NAME.
         text="NR", type=CONTEXT_VARIABLE.
@@ -26537,19 +26537,19 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_SREC: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="=", type=INDIRECT_SREC_ASSIGNMENT:
                 text=".", type=OPERATOR:
-                    text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                    text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
                     text="_orig", type=STRNUM_LITERAL.
-                text="v", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=2
+                text="v", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
             text="=", type=INDIRECT_SREC_ASSIGNMENT:
-                text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
                 text="other", type=STRNUM_LITERAL.
 
 a     b     i     x     y     a_orig b_orig i_orig x_orig              y_orig
@@ -26581,15 +26581,15 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_SREC: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="=", type=INDIRECT_SREC_ASSIGNMENT:
-                text="v", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=2
-                text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                text="v", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
 
 a=pan,b=pan,i=1,x=0.3467901443380824,y=0.7268028627434533,pan=b,1=i,0.3467901443380824=x,0.7268028627434533=y
 a=eks,b=pan,i=2,x=0.7586799647899636,y=0.5221511083334797,eks=a,pan=b,2=i,0.7586799647899636=x,0.5221511083334797=y
@@ -26637,27 +26637,27 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
     text="=", type=SREC_ASSIGNMENT:
         text="sum", type=FIELD_NAME.
         text="0", type=STRNUM_LITERAL.
-    text="for", type=FOR_SREC: frct=2
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="if_head", type=IF_HEAD:
                 text="if", type=IF_ITEM:
                     text="=~", type=OPERATOR:
-                        text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                        text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
                         text="^[xy]$", type=STRNUM_LITERAL.
-                    text="if_block", type=STATEMENT_BLOCK: frct=0
+                    text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                         text="=", type=SREC_ASSIGNMENT:
                             text="sum", type=FIELD_NAME.
                             text="+", type=OPERATOR:
                                 text="sum", type=FIELD_NAME.
                                 text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-                                    text="k", type=LOCAL_VARIABLE. fridx=0 gridx=1 absidx=3
+                                    text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=1 absolute_index=3
 
 a=pan,b=pan,i=1,x=0.3467901443380824,y=0.7268028627434533,sum=1.073593
 a=eks,b=pan,i=2,x=0.7586799647899636,y=0.5221511083334797,sum=1.280831
@@ -26707,29 +26707,29 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
     text="=", type=SREC_ASSIGNMENT:
         text="sum", type=FIELD_NAME.
         text="float", type=NON_SIGIL_NAME:
             text="0", type=STRNUM_LITERAL.
-    text="for", type=FOR_SREC: frct=2
+    text="for", type=FOR_SREC: frame_var_count=2
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="v", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="for_full_srec_block", type=STATEMENT_BLOCK:
             text="if_head", type=IF_HEAD:
                 text="if", type=IF_ITEM:
                     text="=~", type=OPERATOR:
-                        text="k", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
+                        text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
                         text="^[xy]$", type=STRNUM_LITERAL.
-                    text="if_block", type=STATEMENT_BLOCK: frct=0
+                    text="if_block", type=STATEMENT_BLOCK: frame_var_count=0
                         text="=", type=SREC_ASSIGNMENT:
                             text="sum", type=FIELD_NAME.
                             text="+", type=OPERATOR:
                                 text="sum", type=FIELD_NAME.
                                 text="float", type=NON_SIGIL_NAME:
                                     text="indirect_field_name", type=INDIRECT_FIELD_NAME:
-                                        text="k", type=LOCAL_VARIABLE. fridx=0 gridx=1 absidx=3
+                                        text="k", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=1 absolute_index=3
 
 a=pan,b=pan,i=1,x=0.3467901443380824,y=0.7268028627434533,sum=1.073593
 a=eks,b=pan,i=2,x=0.7586799647899636,y=0.5221511083334797,sum=1.280831
@@ -26822,7 +26822,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="emit", type=EMIT:
             text="emit", type=EMIT:
@@ -26836,7 +26836,7 @@ text="end", type=END: frct=1 maxct=1
             text="stream", type=STREAM:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="o", type=STRING_LITERAL.
@@ -26863,12 +26863,12 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
                 text="i", type=FIELD_NAME.
                 text="100", type=STRNUM_LITERAL.
         text="x", type=FIELD_NAME.
-    text="for", type=FOR_OOSVAR: frct=3
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="k1", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="k2", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-            text="v", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
+                text="k1", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="k2", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+            text="v", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="o", type=STRING_LITERAL.
             text="1", type=STRNUM_LITERAL.
@@ -26879,9 +26879,9 @@ text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
                     text="n", type=STRING_LITERAL.
                     text="3", type=STRNUM_LITERAL.
                     text="4", type=STRNUM_LITERAL.
-                    text="k2", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=2
-                    text="k1", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=1
-                text="v", type=LOCAL_VARIABLE. fridx=2 gridx=0 absidx=3
+                    text="k2", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                    text="k1", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="v", type=LOCAL_VARIABLE. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
 
 
 mlr --opprint --from ./reg_test/input/abixy put -q 
@@ -27067,11 +27067,11 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=2
-    text="for", type=FOR_SREC: frct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=2
+    text="for", type=FOR_SREC: frame_var_count=1
         text="variables", type=FOR_VARIABLES:
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
         text="for_full_srec_block", type=STATEMENT_BLOCK:
 
 mlr -n put -v for (k, k in @*) {}
@@ -27092,12 +27092,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=2
-    text="for", type=FOR_OOSVAR: frct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=2
+    text="for", type=FOR_OOSVAR: frame_var_count=1
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="k", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
+                text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="k", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27120,13 +27120,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_OOSVAR: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_OOSVAR: frame_var_count=2
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="c", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="c", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27149,13 +27149,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_OOSVAR: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_OOSVAR: frame_var_count=2
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-            text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+            text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27178,13 +27178,13 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=3
-    text="for", type=FOR_OOSVAR: frct=2
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=3
+    text="for", type=FOR_OOSVAR: frame_var_count=2
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-            text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+            text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27208,14 +27208,14 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
-    text="for", type=FOR_OOSVAR: frct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="c", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-            text="d", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="c", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+            text="d", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27239,14 +27239,14 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
-    text="for", type=FOR_OOSVAR: frct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-            text="d", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+            text="d", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27270,14 +27270,14 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
-    text="for", type=FOR_OOSVAR: frct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-                text="c", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
-            text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                text="c", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
+            text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27301,14 +27301,14 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
-    text="for", type=FOR_OOSVAR: frct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-            text="d", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+            text="d", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27332,14 +27332,14 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
-    text="for", type=FOR_OOSVAR: frct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-                text="c", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
-            text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                text="c", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
+            text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -27363,14 +27363,14 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=4
-    text="for", type=FOR_OOSVAR: frct=3
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=4
+    text="for", type=FOR_OOSVAR: frame_var_count=3
         text="key_and_value_variables", type=FOR_VARIABLES:
             text="key_variables", type=FOR_VARIABLES:
-                text="a", type=NON_SIGIL_NAME. fridx=0 gridx=0 absidx=1
-                text="b", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=2
-                text="c", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
-            text="c", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=3
+                text="a", type=NON_SIGIL_NAME. frame_relative_index=0 upstack_frame_count=0 absolute_index=1
+                text="b", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=2
+                text="c", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
+            text="c", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=3
         text="empty_keylist", type=OOSVAR_KEYLIST:
         text="for_full_oosvar_block", type=STATEMENT_BLOCK:
 
@@ -37156,7 +37156,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_FROM_FULL_SREC_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="v", type=STRING_LITERAL.
@@ -37177,7 +37177,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_FROM_FULL_SREC_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="v", type=STRING_LITERAL.
@@ -37199,7 +37199,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_FROM_FULL_SREC_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="v", type=STRING_LITERAL.
@@ -37225,12 +37225,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_FROM_FULL_SREC_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="v", type=STRING_LITERAL.
@@ -37256,12 +37256,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_FROM_FULL_SREC_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="v", type=STRING_LITERAL.
@@ -37288,12 +37288,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_FROM_FULL_SREC_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="v", type=STRING_LITERAL.
@@ -37514,7 +37514,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=FULL_SREC_FROM_OOSVAR_ASSIGNMENT:
         text="$*", type=FULL_SREC.
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37535,7 +37535,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=FULL_SREC_FROM_OOSVAR_ASSIGNMENT:
         text="$*", type=FULL_SREC.
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37557,7 +37557,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=FULL_SREC_FROM_OOSVAR_ASSIGNMENT:
         text="$*", type=FULL_SREC.
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37583,12 +37583,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=FULL_SREC_FROM_OOSVAR_ASSIGNMENT:
                 text="$*", type=FULL_SREC.
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37614,12 +37614,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=FULL_SREC_FROM_OOSVAR_ASSIGNMENT:
                 text="$*", type=FULL_SREC.
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37646,12 +37646,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=FULL_SREC_FROM_OOSVAR_ASSIGNMENT:
                 text="$*", type=FULL_SREC.
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37689,7 +37689,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="u", type=STRING_LITERAL.
@@ -37712,7 +37712,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="u", type=STRING_LITERAL.
@@ -37736,7 +37736,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="u", type=STRING_LITERAL.
@@ -37761,7 +37761,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="u", type=STRING_LITERAL.
@@ -37787,7 +37787,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37796,7 +37796,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
                 text="v", type=STRING_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v begin { @u    = @v[1] } /dev/null
@@ -37816,7 +37816,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37826,7 +37826,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
                 text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v begin { @u[2] = @v } /dev/null
@@ -37846,7 +37846,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37856,7 +37856,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
                 text="v", type=STRING_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v begin { @u[2] = @v[1] } /dev/null
@@ -37877,7 +37877,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -37888,7 +37888,7 @@ text="begin", type=BEGIN: frct=1 maxct=1
                 text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v NR == 3 { @u    = @v } /dev/null
@@ -37910,12 +37910,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="u", type=STRING_LITERAL.
@@ -37943,12 +37943,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="u", type=STRING_LITERAL.
@@ -37977,12 +37977,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="u", type=STRING_LITERAL.
@@ -38012,12 +38012,12 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="cond", type=CONDITIONAL_BLOCK:
         text="==", type=OPERATOR:
             text="NR", type=CONTEXT_VARIABLE.
             text="3", type=STRNUM_LITERAL.
-        text="cond_block", type=STATEMENT_BLOCK: frct=0
+        text="cond_block", type=STATEMENT_BLOCK: frame_var_count=0
             text="=", type=OOSVAR_ASSIGNMENT:
                 text="oosvar_keylist", type=OOSVAR_KEYLIST:
                     text="u", type=STRING_LITERAL.
@@ -38043,7 +38043,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -38052,7 +38052,7 @@ text="end", type=END: frct=1 maxct=1
                 text="v", type=STRING_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v end { @u    = @v[1] } /dev/null
@@ -38072,7 +38072,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -38082,7 +38082,7 @@ text="end", type=END: frct=1 maxct=1
                 text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v end { @u[2] = @v } /dev/null
@@ -38102,7 +38102,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -38112,7 +38112,7 @@ text="end", type=END: frct=1 maxct=1
                 text="v", type=STRING_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -v end { @u[2] = @v[1] } /dev/null
@@ -38133,7 +38133,7 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -38144,7 +38144,7 @@ text="end", type=END: frct=1 maxct=1
                 text="1", type=STRNUM_LITERAL.
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
 
 
 mlr put -q @s    += $i; @t=@s;             end{dump; emitp@s; emitp @t} ./reg_test/input/abixy
@@ -42688,60 +42688,60 @@ text="block", type=STATEMENT_BLOCK:
 BLOCKED AST:
 
 FUNCTION DEFINITION:
-text="f", type=FUNC_DEF: frct=2 maxct=2
+text="f", type=FUNC_DEF: frame_var_count=2 max_var_depth=2
     text="f", type=NON_SIGIL_NAME:
-        text="x", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=1
+        text="x", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
     text="func_block", type=STATEMENT_BLOCK:
         text="return_value", type=RETURN_VALUE:
             text="**", type=OPERATOR:
-                text="x", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
+                text="x", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
                 text="2", type=STRNUM_LITERAL.
 
 FUNCTION DEFINITION:
-text="g", type=FUNC_DEF: frct=2 maxct=2
+text="g", type=FUNC_DEF: frame_var_count=2 max_var_depth=2
     text="g", type=NON_SIGIL_NAME:
-        text="y", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=1
+        text="y", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
     text="func_block", type=STATEMENT_BLOCK:
         text="return_value", type=RETURN_VALUE:
             text="+", type=OPERATOR:
-                text="y", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
+                text="y", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
                 text="1", type=STRNUM_LITERAL.
 
 SUBROUTINE DEFINITION:
-text="s", type=SUBR_DEF: frct=4 maxct=4
+text="s", type=SUBR_DEF: frame_var_count=4 max_var_depth=4
     text="s", type=NON_SIGIL_NAME:
-        text="a", type=NON_SIGIL_NAME. fridx=1 gridx=0 absidx=1
-        text="b", type=NON_SIGIL_NAME. fridx=2 gridx=0 absidx=2
-        text="c", type=NON_SIGIL_NAME. fridx=3 gridx=0 absidx=3
+        text="a", type=NON_SIGIL_NAME. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
+        text="b", type=NON_SIGIL_NAME. frame_relative_index=2 upstack_frame_count=0 absolute_index=2
+        text="c", type=NON_SIGIL_NAME. frame_relative_index=3 upstack_frame_count=0 absolute_index=3
     text="subr_block", type=STATEMENT_BLOCK:
         text="print", type=PRINT:
             text=".", type=OPERATOR:
                 text=".", type=OPERATOR:
-                    text="a", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
-                    text="b", type=LOCAL_VARIABLE. fridx=2 gridx=0 absidx=2
-                text="c", type=LOCAL_VARIABLE. fridx=3 gridx=0 absidx=3
+                    text="a", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
+                    text="b", type=LOCAL_VARIABLE. frame_relative_index=2 upstack_frame_count=0 absolute_index=2
+                text="c", type=LOCAL_VARIABLE. frame_relative_index=3 upstack_frame_count=0 absolute_index=3
             text=">", type=FILE_WRITE:
                 text="stdout", type=STDOUT:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=2 maxct=2
+text="begin", type=BEGIN: frame_var_count=2 max_var_depth=2
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
                 text="a", type=STRING_LITERAL.
             text="0", type=STRNUM_LITERAL.
         text="local", type=LOCAL:
-            text="ell", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
+            text="ell", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
             text="1", type=STRNUM_LITERAL.
         text="print", type=PRINT:
             text=".", type=OPERATOR:
                 text="local1 = ", type=STRNUM_LITERAL.
-                text="ell", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
+                text="ell", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
             text=">", type=FILE_WRITE:
                 text="stdout", type=STDOUT:
 
 BEGIN-BLOCK:
-text="begin", type=BEGIN: frct=1 maxct=1
+text="begin", type=BEGIN: frame_var_count=1 max_var_depth=1
     text="begin_block", type=STATEMENT_BLOCK:
         text="=", type=OOSVAR_ASSIGNMENT:
             text="oosvar_keylist", type=OOSVAR_KEYLIST:
@@ -42754,12 +42754,12 @@ text="begin", type=BEGIN: frct=1 maxct=1
         text="print", type=PRINT:
             text=".", type=OPERATOR:
                 text="local3 = ", type=STRNUM_LITERAL.
-                text="ell", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=0
+                text="ell", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=0
             text=">", type=FILE_WRITE:
                 text="stdout", type=STDOUT:
 
 END-BLOCK:
-text="end", type=END: frct=2 maxct=2
+text="end", type=END: frame_var_count=2 max_var_depth=2
     text="end_block", type=STATEMENT_BLOCK:
         text="emit", type=EMIT:
             text="emit", type=EMIT:
@@ -42767,17 +42767,17 @@ text="end", type=END: frct=2 maxct=2
                     text="a", type=STRING_LITERAL.
             text="stream", type=STREAM:
         text="local", type=LOCAL:
-            text="emm", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
+            text="emm", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
             text="2", type=STRNUM_LITERAL.
         text="print", type=PRINT:
             text=".", type=OPERATOR:
                 text="local2 = ", type=STRNUM_LITERAL.
-                text="emm", type=LOCAL_VARIABLE. fridx=1 gridx=0 absidx=1
+                text="emm", type=LOCAL_VARIABLE. frame_relative_index=1 upstack_frame_count=0 absolute_index=1
             text=">", type=FILE_WRITE:
                 text="stdout", type=STDOUT:
 
 END-BLOCK:
-text="end", type=END: frct=1 maxct=1
+text="end", type=END: frame_var_count=1 max_var_depth=1
     text="end_block", type=STATEMENT_BLOCK:
         text="emit", type=EMIT:
             text="emit", type=EMIT:
@@ -42792,12 +42792,12 @@ text="end", type=END: frct=1 maxct=1
         text="print", type=PRINT:
             text=".", type=OPERATOR:
                 text="local4 = ", type=STRNUM_LITERAL.
-                text="emm", type=LOCAL_VARIABLE. fridx=0 gridx=0 absidx=0
+                text="emm", type=LOCAL_VARIABLE. frame_relative_index=0 upstack_frame_count=0 absolute_index=0
             text=">", type=FILE_WRITE:
                 text="stdout", type=STDOUT:
 
 MAIN BLOCK:
-text="main_block", type=STATEMENT_BLOCK: frct=1 maxct=1
+text="main_block", type=STATEMENT_BLOCK: frame_var_count=1 max_var_depth=1
     text="=", type=OOSVAR_ASSIGNMENT:
         text="oosvar_keylist", type=OOSVAR_KEYLIST:
             text="a", type=STRING_LITERAL.