https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81866
--- Comment #9 from Sokolov Viacheslav <soko.slav at yandex dot ru> --- Looks like it is fixed on trunk along with https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96474
[Bug c++/81866] [8 Regression] ICE with a default template parameter which is a template class nested in a template class
soko.slav at yandex dot ru via Gcc-bugs Thu, 04 Mar 2021 01:35:17 -0800
