https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92411
--- Comment #4 from Will Wray <wjwray at gmail dot com> --- I mis-read this so was too hasty in suggesting "can be closed". The standard states that a expression evaluation fails to be a constant expression if it evaluates "reinterpret_cast" (i.e., by named token, not by the actual strength of cast required, so seems to be the intent). It's a 50/50 split with gcc & icc accepting, clang and msvc rejecting https://gcc.godbolt.org/z/drdT66
