https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106610
Tomasz Kamiński <tkaminsk at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |tkaminsk at gcc dot gnu.org --- Comment #2 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> --- Yes, I believe the intent of [concepts.equality] p6 was exactly to not require the implementation to care about invoking operator on mutable rvalue/lvalue, if stratification of the concept checks specifies only const lvalue calls.