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Subject: [Bug c++/95486] ICE for alias CTAD with non-dependent argument and
 constrained constructor
Date: Wed, 21 Apr 2021 14:27:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95486

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:4806f9157a26cfd66c083bcc01596ff33009c0d6

commit r10-9743-g4806f9157a26cfd66c083bcc01596ff33009c0d6
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Jul 29 22:06:41 2020 -0400

    c++: alias_ctad_tweaks and constrained dguide [PR95486]

    In the below testcase, we're ICEing from alias_ctad_tweaks ultimately
    because the implied deduction guide for X's user-defined constructor
    already has constraints associated with it.  We then carry over these
    constraints to 'fprime', the overlying deduction guide for the alias
    template Y, via tsubst_decl from alias_ctad_tweaks.  Later in
    alias_ctad_tweaks we call get_constraints followed by set_constraints
    without doing remove_constraints in between, which triggers the !found
    assert in set_constraints.

    This patch fixes this issue by adding an intervening call to
    remove_constraints.

    gcc/cp/ChangeLog:

            PR c++/95486
            * pt.c (alias_ctad_tweaks): Call remove_constraints before
            calling set_constraints.

    gcc/testsuite/ChangeLog:

            PR c++/95486
            * g++.dg/cpp2a/class-deduction-alias3.C: New test.

    (cherry picked from commit 71141b1bd537cc516e485c834c2d36abba3f4544)=