[Bug libstdc++/85069] std::invoke_result returns a wrong type

[akrzemi1 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85069

--- Comment #3 from Andrzej Krzemienski <akrzemi1 at gmail dot com> ---
You're correct. It is my bad. Sorry, I assumed they both had identical
interface. This ticket can be closed.