[Bug c++/116666] [15 Regression] firefox does not compile since r15-2331

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116666

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Started with r15-2331-g523836716137d0f7f4088c85752a980f5f971b36

What happens before this patch is mask_type stays mask_index for the template
argument as the dependent attribute was not being applied (correctly).