PR14858: Initial support for proper sizeof... handling within alias templates.

This doesn't quite get alias template equivalence right yet, but handles the
egregious cases where we would silently give the wrong answers.

llvm-svn: 248431

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/test/SemaTemplate/alias-templates.cpp b/clang/test/SemaTemplate/alias-templates.cpp
index e7be184db3d..1849ff64026 100644
--- a/clang/test/SemaTemplate/alias-templates.cpp
+++ b/clang/test/SemaTemplate/alias-templates.cpp
@@ -201,3 +201,23 @@ namespace PR16904 {
   template <typename T, typename U, typename V>
   using derived2 = ::PR16904::base<T, U>::template derived<V>; // expected-error {{expected a type}} expected-error {{expected ';'}}
 }
+
+namespace PR14858 {
+  template<typename ...T> using X = int[sizeof...(T)];
+
+  template<typename ...U> struct Y {
+    using Z = X<U...>;
+  };
+  using A = Y<int, int, int, int>::Z;
+  using A = int[4];
+
+  // FIXME: These should be treated as being redeclarations.
+  template<typename ...T> void f(X<T...> &) {}
+  template<typename ...T> void f(int(&)[sizeof...(T)]) {}
+
+  template<typename ...T> void g(X<typename T::type...> &) {}
+  template<typename ...T> void g(int(&)[sizeof...(T)]) {} // ok, different
+
+  template<typename ...T, typename ...U> void h(X<T...> &) {}
+  template<typename ...T, typename ...U> void h(X<U...> &) {} // ok, different
+}