[Bug c++/67686] [concepts] segfault in finish_call_expr function

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67686

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
*** Bug 67737 has been marked as a duplicate of this bug. ***