https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89565
--- Comment #4 from Fabio Alemagna <falemagn at gmail dot com> --- Just encountered this bug myself, with trunk gcc (11.0.1 20210321 (experimental)). See godbolt: https://godbolt.org/z/TxW137Whh
[Bug c++/89565] [C++2a] ICE on template instantiating user defined non-type template from template value member
falemagn at gmail dot com via Gcc-bugs Mon, 22 Mar 2021 02:31:14 -0700
