[Bug c++/100079] [9/10/11 Regression] Non-type template parameter, itself a nested template, rejected with internal error

[mail at lboeger dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100079

--- Comment #3 from Lukas Böger <mail at lboeger dot de> ---
I believe it should be valid. The revision which turns the snippet from
rejection into an ICE makes sense, as this is about class-type instances as
non-type template parameters.