Parameter packs can't have default arguments.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73262 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
index 8058ad2..00d3e54 100644
--- a/lib/Sema/SemaTemplate.cpp
+++ b/lib/Sema/SemaTemplate.cpp
@@ -187,6 +187,15 @@
= cast<TemplateTypeParmDecl>(TypeParam.getAs<Decl>());
QualType Default = QualType::getFromOpaquePtr(DefaultT);
+ // C++0x [temp.param]p9:
+ // A default template-argument may be specified for any kind of
+ // template-parameter that is not a template parameter pack.
+ if (Parm->isParameterPack()) {
+ Diag(DefaultLoc, diag::err_template_param_pack_default_arg);
+ Parm->setInvalidDecl();
+ return;
+ }
+
// C++ [temp.param]p14:
// A template-parameter shall not be used in its own default argument.
// FIXME: Implement this check! Needs a recursive walk over the types.