1 files changed, 13 insertions, 10 deletions
diff --git a/lib/AST/DeclTemplate.cpp b/lib/AST/DeclTemplate.cpp
index d57a43040f..ea8dd0d3c0 100644
--- a/lib/AST/DeclTemplate.cpp
+++ b/lib/AST/DeclTemplate.cpp
@@ -265,25 +265,28 @@ void TemplateArgumentListBuilder::push_back(const TemplateArgument& Arg) {
     break;
   }
   
-  if (!isAddingFromParameterPack()) {
-    // Add begin and end indicies.
-    Indices.push_back(Args.size());
-    Indices.push_back(Args.size());
-  }
-
-  Args.push_back(Arg);
+  FlatArgs.push_back(Arg);
+  
+  if (!isAddingFromParameterPack())
+    StructuredArgs.push_back(Arg);
 }
 
 void TemplateArgumentListBuilder::BeginParameterPack() {
   assert(!isAddingFromParameterPack() && "Already adding to parameter pack!");
-  
-  Indices.push_back(Args.size());
+
+  PackBeginIndex = FlatArgs.size();
 }
 
 void TemplateArgumentListBuilder::EndParameterPack() {
   assert(isAddingFromParameterPack() && "Not adding to parameter pack!");
+
+  unsigned NumArgs = FlatArgs.size() - PackBeginIndex;
+  TemplateArgument *Args = NumArgs ? &FlatArgs[PackBeginIndex] : 0;
+  
+  StructuredArgs.push_back(TemplateArgument(SourceLocation(), Args, NumArgs,
+                                            /*CopyArgs=*/false));
   
-  Indices.push_back(Args.size());
+  PackBeginIndex = std::numeric_limits<unsigned>::max();
 }  
 
 //===----------------------------------------------------------------------===//