[Bug c++/95735] ICE on invalid non-type template argument

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95735

--- 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:5421fae8b17c7401f3a4ac5b9f414a47f7bda379

commit r11-1516-g5421fae8b17c7401f3a4ac5b9f414a47f7bda379
Author: Marek Polacek <polacek@redhat.com>
Date:   Thu Jun 18 09:38:42 2020 -0400

    c++: ICE in requires-expressions with invalid args [PR95735]

    This ICE-on-invalid goes back to GCC 6.  In finish_template_variable,
    if coerce_innermost_template_parms returns error_mark_node, we pass
    it down to constraints_satisfied_p and that error_mark_node flows
    down to various satisfy_* functions and then to various tsubst_*
    functions, where we crash.  diagnose_constraints also doesn't cope
    with error arglist, so I think we should just return as in the
    patch below.

    gcc/cp/ChangeLog:

            PR c++/95735
            * pt.c (finish_template_variable): Return if
            coerce_innermost_template_parms return error_mark_node.

    gcc/testsuite/ChangeLog:

            PR c++/95735
            * g++.dg/cpp2a/concepts-err2.C: New test.