Check that template template arguments match template template parameters

properly even when a non-type template parameter has a dependent type.

Previously, if a non-type template parameter was dependent, but not dependent
on an outer level of template parameter, we would not match the type of the
parameter. Under [temp.arg.template], we are supposed to check that the types
are equivalent, which means checking for syntactic equivalence in the dependent
case.

This also fixes some accepts-invalids when passing templates with auto-typed
non-type template parameters as template template arguments.

llvm-svn: 291512

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/test/SemaTemplate/temp_arg_template.cpp b/clang/test/SemaTemplate/temp_arg_template.cpp
index 67cde53c928..b0df9149c6e 100644
--- a/clang/test/SemaTemplate/temp_arg_template.cpp
+++ b/clang/test/SemaTemplate/temp_arg_template.cpp
@@ -100,3 +100,9 @@ struct S : public template_tuple<identity, identity> {
 void foo() {
   f7<identity>();
 }
+
+namespace CheckDependentNonTypeParamTypes {
+  template<template<typename T, typename U, T v> class> struct A {}; // expected-note {{previous}}
+  template<typename T, typename U, U v> struct B {}; // expected-note {{different type}}
+  A<B> ab; // expected-error {{different template parameters}}
+}