gcc/testsuite/g++.dg/cpp2a/nontype-class47.C

// PR c++/95291
// { dg-do compile { target c++20 } }

template <typename T = int>
class xy { };

template <xy _size>
struct window_root { };

template <typename minion>
struct flip_horizontally : window_root<minion::size> { };