[Bug c++/86918] internal compiler error: unexpected expression 'v' of kind template_parm_index

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86918

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r223304.  With r223301, there's an error.