Clang segfaulting is somewhat common. It usually doesn't happen, but sometimes when I write some cursed template metaprogramming code it crashes and I'm not sur

Clang segfaulting is somewhat common. It usually doesn't happen, but sometimes when I write some cursed template metaprogramming code it crashes and I'm not surprised. In your case, especially because you are using C++20 concepts, that is a newer feature and you probably hit some less-tested codepath.