[Bug c++/95241] [10/11 Regression] internal compiler error: tree check: expected integer_cst, have range_expr in to_wide, at tree.h:5900

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95241

--- Comment #2 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:e069285cdf457cc85070e522380c4e25b0d2ed25

commit r11-722-ge069285cdf457cc85070e522380c4e25b0d2ed25
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri May 29 09:44:09 2020 -0400

    c++: constexpr ctor with RANGE_EXPR index [PR95241]

    In the testcase below, the CONSTRUCTOR for 'field' contains a RANGE_EXPR
    index:

      {{aggr_init_expr<...>, [1...2]={.off=1}}}

    but get_or_insert_ctor_field isn't prepared to handle looking up a
    RANGE_EXPR index.

    This patch adds limited support to get_or_insert_ctor_field for looking
    up a RANGE_EXPR index.  The limited scope of this patch should make it
    more suitable for backporting, and more extensive support would be
    needed only to handle self-modifying CONSTRUCTORs that contain a
    RANGE_EXPR index, but I haven't yet been able to come up with a testcase
    that actually creates such a CONSTRUCTOR.

    gcc/cp/ChangeLog:

            PR c++/95241
            * constexpr.c (get_or_insert_ctor_field): Add limited support
            for RANGE_EXPR index lookups.

    gcc/testsuite/ChangeLog:

            PR c++/95241
            * g++.dg/cpp0x/constexpr-array25.C: New test.