https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99692
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #9) > (In reply to Jonathan Wakely from comment #4) > > The __rvalue_ostream_type constraints are going away soon: > > https://gcc.gnu.org/pipermail/gcc-patches/2021-March/566863.html > > N.B. that change is on gcc trunk now. And the gcc-11 branch, so the original testcases compile now because the problematic __is_insertable check isn't in the library now. The reduced cases above still fail on all branches.
