https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96185
--- Comment #9 from Will Wray <wjwray at gmail dot com> --- An earlier draft had __builtin_tuple_size as the magic behind the P2141 proposed std::tuple_size automagic generalization to Case 3 class types. There was opposition to that name because it specifically doesn't apply to tuples so I left the naming open, suggesting __builtin_binding_count (and, so, requiring consensus on naming for portability...)
