From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Tue, 4 Dec 2012 06:44:19 +0000 (+0000)
Subject: compiler: Reject invalid nil == nil comparisons.
X-Git-Tag: releases/gcc-4.8.0~1601
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3fa057a43770dbb23a0fb21a94cab1789df3277c;p=thirdparty%2Fgcc.git

compiler: Reject invalid nil == nil comparisons.

From-SVN: r194119
---

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index bfc1b625d71b..e0690e77bf65 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -5610,6 +5610,11 @@ Binary_expression::do_check_types(Gogo*)
       || this->op_ == OPERATOR_GT
       || this->op_ == OPERATOR_GE)
     {
+      if (left_type->is_nil_type() && right_type->is_nil_type())
+	{
+	  this->report_error(_("invalid comparison of nil with nil"));
+	  return;
+	}
       if (!Type::are_assignable(left_type, right_type, NULL)
 	  && !Type::are_assignable(right_type, left_type, NULL))
 	{