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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/96592] [10/11 Regression] Tuple element w/ member
 reference to incomplete template type rejected
Date: Thu, 03 Sep 2020 15:37:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96592

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:032a4b42cc5f2105f622690ce2552f1c30e1d227

commit r11-2997-g032a4b42cc5f2105f622690ce2552f1c30e1d227
Author: Jonathan Wakely <jwakely@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.=