[Bug c++/84692] Class template argument deduction ICE for template's member template

[columbo@gmx-topmail.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84692

--- Comment #2 from Robert Haberlach <columbo@gmx-topmail.de> ---
And furthermore, I forgot to paste the correct compiler output, as the above
was yielded before I shortened the names:

prog.cc: In substitution of 'template<class U> Y(U, const Ts& ...)-> X<Ts
...>::Y<U> [with U = 128]':
prog.cc:9:7:   required from 'void begin(X<int>)'
prog.cc:14:17:   required from here
prog.cc:9:7: internal compiler error: in tsubst, at cp/pt.c:13992
       Y{0, Ts{}...};