https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93320
--- Comment #4 from Mike Redd <mike.redd at 4embedded dot com> --- FWIW: My code had a problem, but it would have been much easier to debug if the compile didn't crash. :-) In other words, it is possibly not important to handle "type_pack_expansion" in a meaningful way here-- just report some kind of compile error instead of crashing?
