[Bug c++/105452] [10/11/12/13 Regression] static_assert inside anonymous union inside a templated struct causes invalid "inaccessible within this context" error

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105452

--- Comment #6 from CVS 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:58df5350753c00f140c86e60ba5ce0cac686ec4b

commit r13-6949-g58df5350753c00f140c86e60ba5ce0cac686ec4b
Author: Jason Merrill <jason@redhat.com>
Date:   Wed Mar 29 23:27:38 2023 -0400

    c++: anonymous union member reference [PR105452]

    While parsing the anonymous union, we don't yet know that it's an anonymous
    union, so we build the reference to 'v' in the static_assert relative to
the
    union type.  But at instantiation time we know it's an anonymous union, so
    we need to avoid trying to check access for 'v' in the union again; the
    simplest approach seemed to be to make accessible_p step out to the
    containing class.

    While looking at this I also noticed that we were having trouble with DMI
in
    an anonymous union referring to members of the containing class; there
    we just need to give current_class_ptr the right type.

            PR c++/105452

    gcc/cp/ChangeLog:

            * search.cc (type_context_for_name_lookup): New.
            (accessible_p): Handle anonymous union.
            * init.cc (maybe_instantiate_nsdmi_init): Use
            type_context_for_name_lookup.
            * parser.cc (cp_parser_class_specifier): Likewise.
            * cp-tree.h (type_context_for_name_lookup): Declare.

    gcc/testsuite/ChangeLog:

            * g++.dg/lookup/anon8.C: New test.