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

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

tests/parser/tstmtlist_expr.nim

@@ -0,0 +1,20 @@
+discard """
+  output: '''10'''
+"""
+
+proc xx(a: int): int =
+  let y = 0
+  return
+    var x = 0
+    x + y
+
+proc b(x: int): int = 
+  raise 
+    var e: ref Exception
+    new(e)
+    e.msg = "My Exception msg"
+    e
+
+##issue 4035
+echo(5 +
+5)