diff --git a/c/reg_test/expected/out b/c/reg_test/expected/out
index 59a1bff8f..51b084467 100644
--- a/c/reg_test/expected/out
+++ b/c/reg_test/expected/out
@@ -46535,3 +46535,59 @@ a=hat,b=wye,i=9,x=0.03144187646093577,y=45
 }
 a=pan,b=wye,i=10,x=0.5026260055412137,y=55
 
+mlr --from ./reg_test/input/abixy-het put func f(x) {return {"a":x,"b":x**2}}; map o = f($x); $* = o
+a=0.346790,b=0.120263
+a=0.758680,b=0.575595
+a=0.204603,b=0.041863
+a=0.381399,b=0.145465
+a=,b=
+a=0.527126,b=0.277862
+a=0.611784,b=0.374280
+a=0.598554,b=0.358267
+a=0.031442,b=0.000989
+a=0.502626,b=0.252633
+
+mlr --from ./reg_test/input/abixy-het put -q func f(x) {return x**2}; var z = f($x); dump z
+0.120263
+0.575595
+0.041863
+0.145465
+
+0.277862
+0.374280
+0.358267
+0.000989
+0.252633
+
+mlr --from ./reg_test/input/abixy-het put -q func f(x) {map m = {NR:x};return m}; z = f($y); dump z
+{
+  "1": 0.726803
+}
+{
+  "2": 0.522151
+}
+{
+  "3": 0.338319
+}
+{
+  "4": 0.134189
+}
+{
+  "5": 0.863624
+}
+{
+  "6": 0.493221
+}
+{
+  "7": 0.187885
+}
+{
+  "8": 
+}
+{
+  "9": 0.749551
+}
+{
+  "10": 0.952618
+}
+
diff --git a/c/reg_test/run b/c/reg_test/run
index 8993ad892..d0d4c72c8 100755
--- a/c/reg_test/run
+++ b/c/reg_test/run
@@ -5488,6 +5488,10 @@ run_mlr --from $indir/abixy put '
   $y = @sum;
 '
 
+run_mlr --from $indir/abixy-het put 'func f(x) {return {"a":x,"b":x**2}}; map o = f($x); $* = o'
+run_mlr --from $indir/abixy-het put -q 'func f(x) {return x**2}; var z = f($x); dump z'
+run_mlr --from $indir/abixy-het put -q 'func f(x) {map m = {NR:x};return m}; z = f($y); dump z'
+
 # ================================================================
 # A key feature of this regression script is that it can be invoked from any
 # directory. Depending on the directory it's invoked from, the path to $outdir