[Concepts] Concept definitions (D40381)

First in a series of patches to land C++2a Concepts support.
This patch adds AST and parsing support for concept-declarations.

llvm-svn: 365699

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index c50592c4ff8..c0b946a98d1 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -5169,7 +5169,8 @@ static NamedDecl *getDefinitionToImport(NamedDecl *D) {
   if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D))
     return PD->getDefinition();
   if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
-    return getDefinitionToImport(TD->getTemplatedDecl());
+    if (NamedDecl *TTD = TD->getTemplatedDecl())
+      return getDefinitionToImport(TTD);
   return nullptr;
 }