cleaned up command expressions

tests/parser/tcommand_as_expr.nim

@@ -1,12 +1,17 @@
 discard """
-  output: "12"
+  output: '''140
+5-120'''
 """
 
+proc optarg(x:int):int = x
+proc singlearg(x:int):int = 20*x
+echo optarg 1, singlearg 2
+
+
 proc foo(x: int): int = x-1
 proc foo(x, y: int): int = x-y
 
-let x = foo 7.foo,  # comment here
-            foo(1, foo 8)
-#  12 =       6     -     -6
-echo x
+let x = optarg foo 7.foo
+let y = singlearg foo(1, foo 8)
 
+echo x, y