5 files changed, 19 insertions, 13 deletions
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 2024acc9755..5abacca732c 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2305,6 +2305,10 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) {
     return true;
   }
 
+  // If the old declaration is invalid, just give up here.
+  if (Old->isInvalidDecl())
+    return true;
+
   // Determine whether the previous declaration was a definition,
   // implicit declaration, or a declaration.
   diag::kind PrevDiag;
diff --git a/clang/test/CXX/basic/basic.start/basic.start.main/p2.cpp b/clang/test/CXX/basic/basic.start/basic.start.main/p2.cpp
index cd912b834d7..5c7d60c1df4 100644
--- a/clang/test/CXX/basic/basic.start/basic.start.main/p2.cpp
+++ b/clang/test/CXX/basic/basic.start/basic.start.main/p2.cpp
@@ -15,8 +15,8 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST10
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST11
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST12
-// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST12
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST13
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST14
 
 #if TEST1
 
@@ -103,6 +103,13 @@ int main(void) {}
 template <typename T>
 int main(void); // expected-error{{'main' cannot be a template}}
 
+#elif TEST14
+
+template <typename T>
+int main(void); // expected-error{{'main' cannot be a template}}
+
+int main(void) {}
+
 #else
 
 #error Unknown test mode
diff --git a/clang/test/Parser/DelayedTemplateParsing.cpp b/clang/test/Parser/DelayedTemplateParsing.cpp
index 77b47239f4c..3e429d41162 100644
--- a/clang/test/Parser/DelayedTemplateParsing.cpp
+++ b/clang/test/Parser/DelayedTemplateParsing.cpp
@@ -11,7 +11,8 @@ class A {
 template <class T>
 class B {
    void foo4() { } // expected-note {{previous definition is here}}  expected-note {{previous definition is here}}
-   void foo4() { } // expected-error {{class member cannot be redeclared}} expected-error {{redefinition of 'foo4'}}  expected-note {{previous definition is here}}
+   void foo4() { } // expected-error {{class member cannot be redeclared}} expected-error {{redefinition of 'foo4'}}
+   void foo5() { } // expected-note {{previous definition is here}}
 
    friend void foo3() {
        undeclared();
@@ -20,7 +21,7 @@ class B {
 
 
 template <class T>
-void B<T>::foo4() {// expected-error {{redefinition of 'foo4'}}
+void B<T>::foo5() { // expected-error {{redefinition of 'foo5'}}
 }
 
 template <class T>
diff --git a/clang/test/Sema/warn-main.c b/clang/test/Sema/warn-main.c
index b67f96125d4..58a6dfde108 100644
--- a/clang/test/Sema/warn-main.c
+++ b/clang/test/Sema/warn-main.c
@@ -14,16 +14,14 @@ static int main() {
   return 0;
 }
 
-// expected-error@+3 {{redefinition of 'main'}}
-// expected-error@+2 {{'main' is not allowed to be declared inline}}
-// expected-note@+1 {{previous definition is here}}
+// expected-error@+2 {{redefinition of 'main'}}
+// expected-error@+1 {{'main' is not allowed to be declared inline}}
 inline int main() {
 // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:1-[[@LINE-1]]:8}:""
   return 0;
 }
 
-// expected-warning@+6 {{function 'main' declared 'noreturn' should not return}}
-// expected-error@+3 {{redefinition of 'main'}}
+// expected-warning@+5 {{function 'main' declared 'noreturn' should not return}}
 // expected-warning@+2 {{'main' is not allowed to be declared _Noreturn}}
 // expected-note@+1 {{remove '_Noreturn'}}
 _Noreturn int main() {
diff --git a/clang/test/SemaTemplate/canonical-expr-type.cpp b/clang/test/SemaTemplate/canonical-expr-type.cpp
index 7582df5e66a..4770c4fa3ed 100644
--- a/clang/test/SemaTemplate/canonical-expr-type.cpp
+++ b/clang/test/SemaTemplate/canonical-expr-type.cpp
@@ -22,14 +22,10 @@ void f0a(T x, __typeof__(f(N)) y) { } // expected-note{{previous}}
 void f(int);
 
 template<typename T, T N>
-void f0a(T x, __typeof__(f(N)) y) { } // expected-error{{redefinition}} \
-                                      // expected-note{{previous}}
+void f0a(T x, __typeof__(f(N)) y) { } // expected-error{{redefinition}}
 
 void f(float);
 
-template<typename T, T N>
-void f0a(T x, __typeof__(f(N)) y) { } // expected-error{{redefinition}}
-
 // Test dependently-sized array canonicalization
 template<typename T, int N, int M>
 void f1(T (&array)[N + M]) { } // expected-note{{previous}}