[Parser] Clear the TemplateParamScope bit of the current scope's flag

if we are parsing a template specialization.

This commit makes changes to clear the TemplateParamScope bit and set
the TemplateParamParent field of the current scope to null if a template
specialization is being parsed.

Before this commit, Sema::ActOnStartOfLambdaDefinition would check
whether the parent template scope had any decls to determine whether
or not a template specialization was being parsed. This wasn't correct
since it couldn't distinguish between a real template specialization and
a template defintion with an unnamed template parameter (only template
parameters with names are added to the scope's decl list). To fix the
bug, this commit changes the code to check the pointer to the parent
template scope rather than the decl list.

rdar://problem/23440346

Differential Revision: http://reviews.llvm.org/D19175

llvm-svn: 267975

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/vartemplate-lambda.cpp b/clang/test/SemaCXX/vartemplate-lambda.cpp
index d5ad155d0e3..9dab6da3d1e 100644
--- a/clang/test/SemaCXX/vartemplate-lambda.cpp
+++ b/clang/test/SemaCXX/vartemplate-lambda.cpp
@@ -1,6 +1,9 @@
 // RUN: %clang_cc1 -std=c++14 -fsyntax-only -verify %s
 // expected-no-diagnostics
 
+template <class> auto fn0 = [] {};
+template <typename> void foo0() { fn0<char>(); }
+
 template<typename T> auto fn1 = [](auto a) { return a + T(1); };
 
 template <typename X>