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Subject: [Bug c++/105351] [concepts] Constraint checking does correctly match
 static member attributes
Date: Tue, 03 May 2022 19:21:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105351

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:a16fc9f1c96c7361d0b7a83a06f3649ace6c440d

commit r13-95-ga16fc9f1c96c7361d0b7a83a06f3649ace6c440d
Author: Patrick Palka <ppalka@redhat.com>
Date:   Tue May 3 15:21:26 2022 -0400

    c++: make finish_non_static_data_member SFINAE enabled [PR105351]

    Here since finish_non_static_data_member isn't SFINAE enabled, we
    incorrectly emit an error when considering the first overload rather
    than silently discarding it:

    sfinae33.C: In substitution of =C3=A2template<class T> A<T::value> f() =
[with T
=3D B]=C3=A2:
    sfinae33.C:11:7:   required from here
    sfinae33.C:5:31: error: invalid use of non-static data member
=C3=A2B::value=C3=A2
        5 | template<class T> A<T::value> f();
          |                               ^

    This patch makes the function SFINAE enabled in the usual way: give it a
    complain parameter, check it before emitting an error, and pass it thro=
ugh
    appropriately.

            PR c++/105351

    gcc/cp/ChangeLog:

            * cp-tree.h (finish_non_static_data_member): Add defaulted
            complain parameter.
            * pt.cc (tsubst_copy_and_build): Pass complain to
            finish_non_static_data_member.
            * semantics.cc (finish_non_static_data_member): Respect complain
            parameter.
            (finish_qualified_id_expr): Pass complain to
            finish_non_static_data_member.

    gcc/testsuite/ChangeLog:

            * g++.dg/template/sfinae33.C: New test.=