[Bug c++/65072] Segfault when parsing dectlype in trailing return type

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65072

--- Comment #11 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #10)
> Actually, sorry for the error, it really started with r151529.

Thanks -- I think I have a fix now.