Allow passing a callable with type vars in self types #18401
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Fixes #18400
@ilevkivskyi I'd appreciate if you checked the logic in this PR because I enabled polymorphic inference for binding self and had to handle
[T] () -> (T) -> T
into() -> [T] (T) -> T
... I remember seeing this kind of push down logic before, but I can't remember if there's a common function or if there is an issue with doing that.