[Bug c++/68929] GCC hangs in nested template instantiations even after static_assert fails.

[eric at efcs dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929

--- Comment #1 from Eric Fiselier <eric at efcs dot ca> ---
Created attachment 37044
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37044&action=edit
reproducer.cpp

standalone reproducer