[PATCH] AST: Don't treat a TemplateExpansion as a Template

[David Majnemer]

Hi doug.gregor, rsmith,

Instead of calling getAsTemplate(), call
getAsTemplateOrTemplatePattern() because it handles the
TemplateExpansion case too.

This fixes PR16997.

http://llvm-reviews.chandlerc.com/D1512

Files:
  lib/AST/TypeLoc.cpp
  test/SemaCXX/crash-lambda-12645424.cpp

Index: lib/AST/TypeLoc.cpp
===================================================================
--- lib/AST/TypeLoc.cpp
+++ lib/AST/TypeLoc.cpp
@@ -378,18 +378,16 @@
     case TemplateArgument::Template:
     case TemplateArgument::TemplateExpansion: {
       NestedNameSpecifierLocBuilder Builder;
-      TemplateName Template = Args[i].getAsTemplate();
+      TemplateName Template = Args[i].getAsTemplateOrTemplatePattern();
       if (DependentTemplateName *DTN = Template.getAsDependentTemplateName())
         Builder.MakeTrivial(Context, DTN->getQualifier(), Loc);
       else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName())
         Builder.MakeTrivial(Context, QTN->getQualifier(), Loc);
-      
+
       ArgInfos[i] = TemplateArgumentLocInfo(
-                                           Builder.getWithLocInContext(Context),
-                                            Loc, 
-                                Args[i].getKind() == TemplateArgument::Template
-                                            ? SourceLocation()
-                                            : Loc);
+          Builder.getWithLocInContext(Context), Loc,
+          Args[i].getKind() == TemplateArgument::Template ? SourceLocation()
+                                                          : Loc);
       break;
     }
 
Index: test/SemaCXX/crash-lambda-12645424.cpp
===================================================================
--- test/SemaCXX/crash-lambda-12645424.cpp
+++ test/SemaCXX/crash-lambda-12645424.cpp
@@ -41,3 +41,14 @@
 class Z {
   int empty = on(0) >> [] {}; // expected-error {{invalid operands to binary expression}}
 };
+
+template <template <typename> class... Templates>
+struct template_tuple {};
+template <typename T>
+struct identity {};
+template <template <typename> class... Templates>
+template_tuple<Templates...> f7() {}
+
+void foo() {
+  f7<identity>();
+}
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