From c61361b102fcb9be7b64cc493fb797ea551eb8e7 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 8 Mar 2013 22:15:15 +0000
Subject: [PATCH] <rdar://problem/13094134> Don't try to wire up typedef names
 for invalid anonymous tag declarations encountered during template
 instantiation.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176727 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaTemplateInstantiateDecl.cpp |  2 +-
 test/SemaTemplate/instantiate-type.cpp   | 13 ++++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index d54ca31565..c39f006258 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -229,7 +229,7 @@ Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D,
   // tag decl, re-establish that relationship for the new typedef.
   if (const TagType *oldTagType = D->getUnderlyingType()->getAs<TagType>()) {
     TagDecl *oldTag = oldTagType->getDecl();
-    if (oldTag->getTypedefNameForAnonDecl() == D) {
+    if (oldTag->getTypedefNameForAnonDecl() == D && !Invalid) {
       TagDecl *newTag = DI->getType()->castAs<TagType>()->getDecl();
       assert(!newTag->getIdentifier() && !newTag->getTypedefNameForAnonDecl());
       newTag->setTypedefNameForAnonDecl(Typedef);
diff --git a/test/SemaTemplate/instantiate-type.cpp b/test/SemaTemplate/instantiate-type.cpp
index f5d02707cb..2440a38f3e 100644
--- a/test/SemaTemplate/instantiate-type.cpp
+++ b/test/SemaTemplate/instantiate-type.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only %s
+// RUN: %clang_cc1 -fsyntax-only -verify %s
 
 int* f(int);
 float *f(...);
@@ -15,3 +15,14 @@ X<int>::typeof_type &iptr1 = iptr0;
 
 X<int>::typeof_expr &iptr2 = iptr0;
 X<float*>::typeof_expr &fptr1 = fptr0;
+
+namespace rdar13094134 {
+  template <class>
+  class X {
+    typedef struct {
+      Y *y; // expected-error{{unknown type name 'Y'}}
+    } Y; 
+  };
+
+  X<int> xi;
+}
-- 
2.40.0