r186726 - Correctly handle packs for variadic type traits.

[Eli Friedman]

Author: efriedma
Date: Fri Jul 19 16:49:32 2013
New Revision: 186726

URL: http://llvm.org/viewvc/llvm-project?rev=186726&view=rev
Log:
Correctly handle packs for variadic type traits.

I'm not sure how to write a test for this; the following shows the
difference in -ast-dump:

template <int x> struct A {};
template <class T> struct B { };
template <class ...Args> using C = A<(__is_trivially_constructible(Args...))>;
template <class ...Args> using D = C<B<Args>...>;

However, I can't seem to write a test that triggers a visible difference
in behavior.

Modified:
    cfe/trunk/lib/Sema/TreeTransform.h

Modified: cfe/trunk/lib/Sema/TreeTransform.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/TreeTransform.h?rev=186726&r1=186725&r2=186726&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/TreeTransform.h (original)
+++ cfe/trunk/lib/Sema/TreeTransform.h Fri Jul 19 16:49:32 2013
@@ -7926,6 +7926,19 @@ TreeTransform<Derived>::TransformTypeTra
       if (To.isNull())
         return ExprError();
 
+      if (To->containsUnexpandedParameterPack()) {
+        To = getDerived().RebuildPackExpansionType(To,
+                                                   PatternTL.getSourceRange(),
+                                                   ExpansionTL.getEllipsisLoc(),
+                                                   NumExpansions);
+        if (To.isNull())
+          return ExprError();
+
+        PackExpansionTypeLoc ToExpansionTL
+          = TLB.push<PackExpansionTypeLoc>(To);
+        ToExpansionTL.setEllipsisLoc(ExpansionTL.getEllipsisLoc());
+      }
+
       Args.push_back(TLB.getTypeSourceInfo(SemaRef.Context, To));
     }