[Bug c++/92593] [10 Regression] ICE with CTAD using undeclared constraint

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92593

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Another testcase:

template<int>
struct ref_view
{
  ref_view(T) { };
};

ref_view r{1};