https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84662
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Started with r230365. Before it got rejected with pr84662.C:2:3: error: expected constructor, destructor, or type conversion before ‘(’ token a (__attribute__((c(0 && int() - ([] {} && b) || auto)))); ^