[Bug c++/96204] gcc complains about private member access in SFINAE context

[lts-rudolph at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96204

--- Comment #1 from Klaus Rudolph <lts-rudolph at gmx dot de> ---
Maybe related to: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64335