Fix assert when instantiating a default argument of a template defined in a

module.

llvm-svn: 187556

clang/lib/AST/Decl.cpp

@@ -1959,7 +1959,10 @@ TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
 }
 
 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
-  return getASTContext().getInstantiatedFromStaticDataMember(this);
+  if (isStaticDataMember())
+    return getASTContext().getInstantiatedFromStaticDataMember(this);
+
+  return 0;
 }
 
 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,

clang/test/Modules/Inputs/cxx-templates-a.h

@@ -20,3 +20,5 @@ template<typename T> void PerformDelayedLookup(T &t) {
   typename T::Inner inner;
   FoundByADL(t);
 }
+
+template<typename T> void PerformDelayedLookupInDefaultArgument(T &t, int a = (FoundByADL(T()), 0)) {}

clang/test/Modules/cxx-templates.cpp

@@ -51,6 +51,9 @@ void g() {
   // 'common'. That type is not visible here.
   PerformDelayedLookup(defined_in_common);
 
+  // Likewise, but via a default argument.
+  PerformDelayedLookupInDefaultArgument(defined_in_common);
+
   // Trigger the instantiation of a template in 'b' that uses a type defined in
   // 'b_impl'. That type is not visible here.
   UseDefinedInBImpl<int>();