https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116844
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I think this isn't rejects-valid, http://eel.is/c++draft/dcl.fct#17 says that typedef introduced functions should be only declared, not defined, and {} or = delete; or = delete ("reason"); are definitions (and I think using is counted as typedef). I think all we do wrong is report different errors from what the standard says how it should be parsed (so pedantically a non-issue, we still reject it, but QoI).
