[Bug c++/87125] [9 Regression] ICE in tsubst_copy starting with r261084

[ensadc at mailnesia dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87125

ensadc at mailnesia dot com changed:

           What    |Removed                     |Added
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                 CC|                            |ensadc at mailnesia dot com

--- Comment #2 from ensadc at mailnesia dot com ---
Reduced:

template<typename br> struct ch {
  template<typename by> constexpr ch(by) noexcept(br());
};
class ce : ch<int> {
  using ch::ch;
};

void f() {
  noexcept(ce(0));
}