Support for stmtListExpr in parser after major keywords. Scaled down version. (#10852)

* Support for stmtListExpr in parser after major keywords
* fixes #4035

tests/macros/ttryparseexpr.nim

@@ -1,5 +1,5 @@
 discard """
-  outputsub: '''Error: invalid indentation 45'''
+  outputsub: '''Error: expression expected, but found '[EOF]' -- 45'''
 """
 
 # feature request #1473
@@ -9,6 +9,7 @@ macro test(text: string): untyped =
   try:
     result = parseExpr(text.strVal)
   except ValueError:
+    echo text
     result = newLit getCurrentExceptionMsg()
 
 const
@@ -17,4 +18,4 @@ const
   b = test("valid")
   c = test("\"") # bug #2504
 
-echo a, " ", b
+echo a, " -- ", b