From 223ca5c9abe5a19bd0d8677d732b3ca5d512c4da Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Mon, 18 Feb 2013 17:22:23 +0000
Subject: [PATCH] Prevent crash on multiple user errors (which I cannot
 reproduce in a small test case). // rdar://13178483.

llvm-svn: 175450
---
 clang/lib/Sema/SemaExpr.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 933105e..86bd7b8 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -1976,6 +1976,10 @@ Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
                          IdentifierInfo *II, bool AllowBuiltinCreation) {
   SourceLocation Loc = Lookup.getNameLoc();
   ObjCMethodDecl *CurMethod = getCurMethodDecl();
+  
+  // Check for error condition which is already reported.
+  if (!CurMethod)
+    return ExprError();
 
   // There are two cases to handle here.  1) scoped lookup could have failed,
   // in which case we should look for an ivar.  2) scoped lookup could have
-- 
2.7.4