https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57941
Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |paolo.carlini at oracle dot com --- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> --- In mainline we made progress on this issue (I should track down when and why): after the "because" note we print: 57941.C:5:33: error: call to non-constexpr function ‘int a<T>::c() const [with T = int]’ constexpr int b () { return c (); }