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Subject: [Bug libstdc++/100667] [11/12/13/14 Regression] std::tuple<A&&>
 cannot be constructed from A&&, if A not defined (only forward declared)
Date: Thu, 28 Mar 2024 18:26:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100667

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:8bb3ef3f6e335e8794590fb712a2661d11d21973

commit r14-9713-g8bb3ef3f6e335e8794590fb712a2661d11d21973
Author: Jason Merrill <jason@redhat.com>
Date:   Wed Mar 27 16:14:01 2024 -0400

    c++: __is_constructible ref binding [PR100667]

    The requirement that a type argument be complete is excessive in the ca=
se
of
    direct reference binding to the same type, which does not rely on any
    properties of the type.  This is LWG 2939.

            PR c++/100667

    gcc/cp/ChangeLog:

            * semantics.cc (same_type_ref_bind_p): New.
            (finish_trait_expr): Use it.

    gcc/testsuite/ChangeLog:

            * g++.dg/ext/is_constructible8.C: New test.=