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Subject: [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
Date: Tue, 14 Mar 2023 15:19:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108972

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:7f22d1c83e74c41116300bebac2e4c492c90b03d

commit r13-6664-g7f22d1c83e74c41116300bebac2e4c492c90b03d
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Mar 14 16:18:47 2023 +0100

    testsuite: Fix up g++.dg/cpp2a/concepts-lambda3.C [PR108972]

    On Fri, Mar 10, 2023 at 01:49:38PM -0500, Jason Merrill via Gcc-patches
wrote:
    > gcc/testsuite/ChangeLog:
    >
    >       * g++.dg/cpp2a/concepts-lambda3.C: Run at lower std levels,
    >       but expect errors.

    I'm seeing
    +UNRESOLVED: g++.dg/cpp2a/concepts-lambda3.C  -std=3Dc++11 compilation =
failed
to produce executable
    +UNRESOLVED: g++.dg/cpp2a/concepts-lambda3.C  -std=3Dc++14 compilation =
failed
to produce executable
    +UNRESOLVED: g++.dg/cpp2a/concepts-lambda3.C  -std=3Dc++17 compilation =
failed
to produce executable
    +UNRESOLVED: g++.dg/cpp2a/concepts-lambda3.C  -std=3Dc++98 compilation =
failed
to produce executable
    with this change, and if I test with
    GXX_TESTSUITE_STDS=3D98,11,14,17,20,2b make check-g++ -k
RUNTESTFLAGS=3D"--target_board=3Dunix\{-m32,-m64,-m64/-fconcepts\}
dg.exp=3Dconcepts-lambda3.C"
    I see even FAILs for the -fconcepts case, so apparently even -std=3Dc++=
17
    -fconcepts isn't enough to make it compile without errors.

    The following patch will expect errors for all of c++17_down and will
    make the test dg-do compile for that case too, such that the UNRESOLVED
    stuff is gone.

    2023-03-14  Jakub Jelinek  <jakub@redhat.com>

            PR c++/108972
            PR testsuite/109129
            * g++.dg/cpp2a/concepts-lambda3.C: Use dg-do run only for c++20,
            for c++17_down dg-do compile.  Expect dg-excess-errors for
c++17_down
            rather than ! concepts.=