https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90880
--- Comment #1 from Federico Kircheis <federico.kircheis at gmail dot com> --- After researching a little bit more, I've convinced myself that `status<c1>::value` should be false, as `decltype` has no special rules for accessing private data, thus clang is correct. If someone could confirm this, I could try to make a bug report to the msvc team
