[Bug c++/120204] `is not usable as a 'constexpr' function because` and no reason why

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120204

--- Comment #1 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:b5f61a09c1ab3a45398333b50963e533a980b62d

commit r16-506-gb5f61a09c1ab3a45398333b50963e533a980b62d
Author: Jason Merrill <ja...@redhat.com>
Date:   Fri May 9 18:08:43 2025 -0400

    c++: recursive instantiation diagnostic [PR120204]

    Here tsubst_baselink was returning error_mark_node silently despite
    tf_error; we need to actually give an error.

            PR c++/120204

    gcc/cp/ChangeLog:

            * pt.cc (tsubst_baselink): Always error if lookup fails.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1y/constexpr-recursion3.C: New test.