template<typename class T, T = T()> // { dg-error "nested-name-specifier|two or more|valid type" }
struct A {}; // { dg-error "definition"
-template<int> void foo(A<int>); // { dg-error "mismatch|constant" }
+template<int> void foo(A<int>); // { dg-error "mismatch|constant|template argument" }