added test for multidimensional for loop

examples/test-commands.wt

@@ -87,3 +87,13 @@ set RESULT
     cat testfile
     rm testfile
 check RESULT = -5;-6;-7;-8;-9;
+# multi dimensional for loops
+# VAR colides with VARS1 and VARS2
+unset VAR
+set VARS1 = 1, 2, 3, 4
+set VARS2 = a, b, c, d
+set RESULT =
+for VARS1
+  for VARS2
+    set RESULT = RESULTVARS1.VARS2;
+check RESULT = 1.a;1.b;1.c;1.d;2.a;2.b;2.c;2.d;3.a;3.b;3.c;3.d;4.a;4.b;4.c;4.d;