[Bug c++/89648] [9 Regression] rejects-valid error starting with r268850

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89648

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced from webkitgtk-2.23.92.