[Bug c++/115586] c++26: with 2 or more name-independent declarations (anonymous/placeholder structure bindings) with for loop

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115586

--- Comment #10 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-14 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:08bfa32ae92e36a791ebdefd063b4f2616cd6f80

commit r14-11297-g08bfa32ae92e36a791ebdefd063b4f2616cd6f80
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Feb 7 17:08:39 2025 +0100

    c++: Fix up name independent decl in structured binding handling in range
for [PR115586]

    cp_parser_range_for temporarily reverts IDENTIFIER_BINDING changes
    to hide the decls from the structured bindings from lookup during
    parsing of the expression after :
    If there are 2 or more name independent decls, we undo IDENTIFIER_BINDING
    for the same name multiple times, even when just one has been added
    (with a TREE_LIST inside of it as decl).

    The following patch fixes it by handling the _ name at most once, the
    later loop will DTRT then and just reinstall the temporarily hidden
    binding with the TREE_LIST in there.

    2025-02-07  Jakub Jelinek  <jakub@redhat.com>

            PR c++/115586
            * parser.cc (cp_parser_range_for): For name independent decls in
            structured bindings, only push the name/binding once per
            structured binding.

            * g++.dg/cpp26/name-independent-decl9.C: New test.
            * g++.dg/cpp26/name-independent-decl10.C: New test.

    (cherry picked from commit ca7c6d1212b8589deed18386427c67851af2b9ad)