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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/96745] [concepts] internal compiler error: in
 type_memfn_rqual, at cp/typeck.c:10389
Date: Fri, 03 Feb 2023 14:15:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96745

--- Comment #6 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:ed2b519e02eac99fadfa51adc7b11f8854c24575

commit r13-5683-ged2b519e02eac99fadfa51adc7b11f8854c24575
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Feb 3 09:15:29 2023 -0500

    c++: ICE on unviable/ambiguous constrained dtors [PR96745]

    Here we're crashing from check_bases_and_members due to
    CLASSTYPE_DESTRUCTOR being an OVERLOAD which, due to the pruning
    performed by add_method, should only happen if there is no viable
    destructor or the destructor is ambiguous because of unsatisfied
    or ambiguous constraints.

    This patch fixes this by making check_bases_and_members naturally handle
    CLASSTYPE_DESTRUCTOR being an OVERLOAD.  It's then convenient to prune
    the OVERLOAD after effectively diagnosing the overload resolution
    failure in check_methods.

            PR c++/96745

    gcc/cp/ChangeLog:

            * class.cc (check_methods): Diagnose an unviable OVERLOAD
            set for CLASSTYPE_DESTRUCTOR differently from an ambiguous one.
            Then prune the OVERLOAD to a single function.
            (check_bases_and_members): Handle CLASSTYPE_DESTRUCTOR being
            an OVERLOAD when calling deduce_noexcept_on_destructor.
            Document why it has to be called before check_methods.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/concepts-dtor1.C: New test.=