https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51653
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Marc Glisse from comment #3) > The suggestion in this PR is quite wild, but the fact that > sizeof(tuple<tuple<tuple<tuple<tuple<int>>>>>)==20 is a real issue that > could probably be solved with less trouble (still ABI-breaking). Maybe I > should have split the PR... That's fixed by the patch attached to PR56785
