https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87125
--- Comment #3 from ensadc at mailnesia dot com --- (In reply to ensadc from comment #2) > 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)); > } This appears similar to bug 87814 (which is fixed in r267155). Maybe a duplicate?