Rename IntoFuture::Future to IntoFuture::IntoFuture

[yoshuawuyts]

Ref: #67644 (comment)

This renames IntoFuture::Future to IntoFuture::IntoFuture. This adds the Into* prefix to the associated type, similar to the IntoIterator::IntoIter associated type. It's my mistake we didn't do so in the first place. This fixes that and brings the two closer together. Thanks!

References

IntoIterator trait def

pub trait IntoIterator {
    type Item;
    type IntoIter: Iterator<Item = Self::Item>;
    fn into_iter(self) -> Self::IntoIter;
}

IntoFuture trait def

pub trait IntoFuture {
    type Output;
    type IntoFuture: Future<Output = Self::Output>; // Prior to this PR: `type Future:`
    fn into_future(self) -> Self::IntoFuture;
}

cc/ @eholk @rust-lang/wg-async

[rust-highfive]

r? @scottmcm

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[yoshuawuyts]

This should probably be labeled T-libs, not T-compiler?

[joshtriplett]

@bors r+

[bors]

📌 Commit 3f2cb6e has been approved by joshtriplett