https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92505
Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |arthur.j.odwyer at gmail dot com --- Comment #4 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> --- Confirmed; the test case can be as simple as // https://godbolt.org/z/M9rf31qqq struct S { mutable int m; }; static_assert(S{42}.m == 42); (Removing the "mutable" keyword makes GCC happy.)