https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106838
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- According to https://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html the precondition for __is_trivial is: "Requires: type shall be a complete type, (possibly cv-qualified) void, or an array of unknown bound." That implies the following should be valid: struct Inc; bool b = __is_trivial(Inc[]); However, the implementation seems to match the requirement for the std::is_trivial trait, which is: "remove_all_extents_t<T> shall be a complete type or cv void." This seems to be just a documentation bug.
