clang/test/Modules/Inputs/merge-template-pattern-visibility/a.h

template<typename, typename = int> struct A;
template<typename T> struct B;

template<typename, typename> struct A {};
template<typename T> struct B : A<T> {};
template<typename T> inline auto C(T) {}

namespace CrossModuleMerge {
  template<typename T> inline auto D(T) {}
  struct E {};
}