[Bug c++/94507] [8/9/10 Regression] internal compiler error: tree check: expected template_decl, have error_mark in tsubst_lambda_expr

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94507

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:77d6dfc929832a542a25fc455b90f1a4bc83229c

commit r10-7636-g77d6dfc929832a542a25fc455b90f1a4bc83229c
Author: Marek Polacek <polacek@redhat.com>
Date:   Mon Apr 6 19:59:04 2020 -0400

    c++: Fix ICE-on-invalid with lambda template [PR94507]

    While reducing something else I noticed that we ICE on the following
    invalid code.  In tsubst_lambda_expr, tsubst_template_decl has already
    reported an error and returned the error_mark_node, so make sure we
    don't ICE on that.  I'm using a goto here because we still have to
    do finish_struct because it does popclass ().

            PR c++/94507 - ICE-on-invalid with lambda template.
            * pt.c (tsubst_lambda_expr): Cope when tsubst_template_decl or
            tsubst_function_decl returns error_mark_node.

            * g++.dg/cpp2a/lambda-generic7.C: New test.