1 files changed, 79 insertions, 0 deletions
diff --git a/clang/test/Parser/cxx2c-template-template-param.cpp b/clang/test/Parser/cxx2c-template-template-param.cpp
new file mode 100644
index 0000000..e8c7621
--- /dev/null
+++ b/clang/test/Parser/cxx2c-template-template-param.cpp
@@ -0,0 +1,79 @@
+// RUN:  %clang_cc1 -std=c++2c -verify %s
+
+template<template<typename> auto Var>
+struct A{};
+template<template<auto> auto Var>
+struct B{};
+template<template<typename> auto Var>
+struct C{};
+template<template<typename> concept C>
+struct D{};
+template<template<auto> concept C>
+struct E{};
+
+template<template<typename> auto Var>
+int V1;
+template<template<auto> auto Var>
+int V2;
+template<template<typename> auto Var>
+int V3;
+template<template<typename> concept C>
+int V4;
+template<template<auto> concept C>
+int V5;
+
+namespace packs {
+
+template<template<typename> auto... Var>
+struct A{};
+template<template<auto> auto... Var>
+struct B{};
+template<template<typename> auto... Var>
+struct C{};
+template<template<typename> concept... C>
+struct D{};
+template<template<auto> concept... C>
+struct E{};
+
+template<template<typename> auto... Var>
+int V1;
+template<template<auto> auto...  Var>
+int V2;
+template<template<typename> auto...  Var>
+int V3;
+template<template<typename> concept... C>
+int V4;
+template<template<auto> concept... C>
+int V5;
+
+}
+
+namespace concepts {
+template<template<auto> concept...>
+struct A{};
+template<template<auto> concept... C>
+struct B{};
+template<template<auto> concept& C> // expected-error{{expected identifier}} \
+                                    // expected-error {{in declaration of struct 'C'}}
+struct C{};
+}
+
+namespace vars {
+template<template<auto> auto...>
+struct A{};
+template<template<auto> auto & C> // expected-error {{expected identifier}} \
+                                  // expected-error {{extraneous 'template<>'}}
+struct B{};
+template<template<auto> const auto> // expected-error {{expected identifier}} \
+                                    // expected-error {{extraneous 'template<>'}}
+struct C{};
+}
+
+namespace errors {
+template<concept> // expected-error {{expected template parameter}} \
+                  // expected-error {{extraneous 'template<>' in declaration of struct 'A'}}
+struct A{};
+template<template<concept> auto> // expected-error {{expected template parameter}} \
+                                 // expected-error {{template template parameter must have its own template parameters}}
+struct B{};
+}