https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96592
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:032a4b42cc5f2105f622690ce2552f1c30e1d227 commit r11-2997-g032a4b42cc5f2105f622690ce2552f1c30e1d227 Author: Jonathan Wakely <jwak...@redhat.com> Date: Thu Sep 3 16:26:16 2020 +0100 libstdc++: Add workaround for weird std::tuple error [PR 96592] This "fix" makes no sense, but it avoids an error from G++ about std::is_constructible being incomplete. The real problem is elsewhere, but this "fixes" the regression for now. libstdc++-v3/ChangeLog: PR libstdc++/96592 * include/std/tuple (_TupleConstraints<true, T...>): Use alternative is_constructible instead of std::is_constructible. * testsuite/20_util/tuple/cons/96592.cc: New test.