From 5cbe101b502e06d16bc77df45a27ce8bc13f33c8 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 5 Jul 2011 18:30:26 +0000
Subject: [PATCH] Look through parenthesized declarators when determining
 whether an instantiated function template was written with a prototype or via
 some kind of typedef. Fixes PR10273 / <rdar://problem/9723679>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134426 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaTemplateInstantiateDecl.cpp     | 2 +-
 test/SemaTemplate/instantiate-function-2.cpp | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index b6d5abfcc8..0a05d0e304 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -1090,7 +1090,7 @@ Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
   Function->setLexicalDeclContext(LexicalDC);
 
   // Attach the parameters
-  if (isa<FunctionProtoType>(Function->getType())) {
+  if (isa<FunctionProtoType>(Function->getType().IgnoreParens())) {
     // Adopt the already-instantiated parameters into our own context.
     for (unsigned P = 0; P < Params.size(); ++P)
       if (Params[P])
diff --git a/test/SemaTemplate/instantiate-function-2.cpp b/test/SemaTemplate/instantiate-function-2.cpp
index 21eccd4901..087ede2b89 100644
--- a/test/SemaTemplate/instantiate-function-2.cpp
+++ b/test/SemaTemplate/instantiate-function-2.cpp
@@ -56,3 +56,11 @@ namespace AliasTagDef {
 
   int n = f<int>();
 }
+
+namespace PR10273 {
+  template<typename T> void (f)(T t) {}
+
+  void g() {
+    (f)(17);
+  }
+}