https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 82171, which changed state.
Bug 82171 Summary: Cant use std::declval in concept testing map operator[] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82171 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED
