https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121566
--- Comment #1 from Jeff Epler <jepler at gmail dot com> --- clang (20.1.0) actually gets it right: https://godbolt.org/z/o3dx8TWYW > <source>:2:33: error: expression is not assignable > 2 | return ??-??-??-??-??-??-??---1; > | ^ ~
