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Subject: [Bug c++/111485] [11/12 Regression] Constraint mismatch on template
 template parameter
Date: Sun, 24 Dec 2023 15:12:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111485

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:84cab505d69038647d98f9340559fc941446e479

commit r11-11168-g84cab505d69038647d98f9340559fc941446e479
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Sep 22 06:25:49 2023 -0400

    c++: constraint rewriting during ttp coercion [PR111485]

    In order to compare the constraints of a ttp with that of its argument,
    we rewrite the ttp's constraints in terms of the argument template's
    template parameters.  The substitution to achieve this currently uses a
    single level of template arguments, but that never does the right thing
    because a ttp's template parameters always have level >=3D 2.  This pat=
ch
    fixes this by including the outer template arguments in the substitutio=
n,
    which ought to match the depth of the ttp.

    The second testcase demonstrates it's better to substitute the concrete
    outer template arguments instead of generic ones since a ttp's constrai=
nts
    could depend on outer parameters.

            PR c++/111485

    gcc/cp/ChangeLog:

            * pt.c (is_compatible_template_arg): New parameter 'args'.
            Add the outer template arguments 'args' to 'new_args'.
            (convert_template_argument): Pass 'args' to
            is_compatible_template_arg.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/concepts-ttp5.C: New test.
            * g++.dg/cpp2a/concepts-ttp6.C: New test.

    (cherry picked from commit 6f902a42b0afe3f3145bcb864695fc290b5acc3e)=