[Bug c++/108972] [13 Regression] ICE: tree check: expected tree that contains 'decl common' structure, have 'error_mark' in compare_lambda_template_head, at cp/lambda.cc:1551 since r13-3601-g2b0e81d5cc2f7e1d

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108972

--- Comment #3 from CVS 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:a915c29a7d63ccb88cfded75ba1c8c4919845e98

commit r13-6594-ga915c29a7d63ccb88cfded75ba1c8c4919845e98
Author: Jason Merrill <ja...@redhat.com>
Date:   Thu Mar 9 17:01:48 2023 -0500

    c++: constrained lambda error-recovery [PR108972]

    Better not to ICE after various valid errors.

            PR c++/108972

    gcc/cp/ChangeLog:

            * lambda.cc (compare_lambda_template_head): Check more
            for error_mark_node.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/concepts-lambda3.C: Run at lower std levels,
            but expect errors.