[Bug c++/124204] [reflection] Internal compiler error when using std::meta::substitute with a reference reflection: in implicit_conversion, at cp/call.cc:2237

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124204

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:195e27c797b695f16032dead8d475eca097ebe5c

commit r16-7744-g195e27c797b695f16032dead8d475eca097ebe5c
Author: Marek Polacek <polacek@redhat.com>
Date:   Tue Feb 24 11:08:55 2026 -0500

    c++/reflection: fix crash with substitute [PR124204]

    Here we crash in implicit_conversion on:

      /* An argument should have gone through convert_from_reference.  */
      gcc_checking_assert (!expr || !TYPE_REF_P (from));

    so let's do that.

            PR c++/124204

    gcc/cp/ChangeLog:

            * reflect.cc (eval_can_substitute): Call convert_from_reference.

    gcc/testsuite/ChangeLog:

            * g++.dg/reflect/substitute5.C: New test.

    Reviewed-by: Jason Merrill <jason@redhat.com>