From 04af9d4051a40a6d1c17be9730224678ce687d02 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Sun, 11 Feb 2018 17:43:56 +0100
Subject: [PATCH] fixes #3711

---
 compiler/semstmts.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/semstmts.nim b/compiler/semstmts.nim
index f4614272c5..f0784021e8 100644
--- a/compiler/semstmts.nim
+++ b/compiler/semstmts.nim
@@ -17,7 +17,7 @@ proc semDiscard(c: PContext, n: PNode): PNode =
   checkSonsLen(n, 1)
   if n.sons[0].kind != nkEmpty:
     n.sons[0] = semExprWithType(c, n.sons[0])
-    if isEmptyType(n.sons[0].typ) or n.sons[0].typ.kind == tyNone:
+    if isEmptyType(n.sons[0].typ) or n.sons[0].typ.kind == tyNone or n.sons[0].kind == nkTypeOfExpr:
       localError(n.info, errInvalidDiscard)
 
 proc semBreakOrContinue(c: PContext, n: PNode): PNode =