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Add Future trait for doc_spotlight feature doc

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Ivan Tham 2021-02-22 19:02:02 +08:00 committed by GitHub
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src/doc/unstable-book/src/language-features/doc-spotlight.md
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@ -5,8 +5,8 @@ The tracking issue for this feature is: [#45040]
The `doc_spotlight` feature allows the use of the `spotlight` parameter to the `#[doc]` attribute,
to "spotlight" a specific trait on the return values of functions. Adding a `#[doc(spotlight)]`
attribute to a trait definition will make rustdoc print extra information for functions which return
a type that implements that trait. This attribute is applied to the `Iterator`, `io::Read`, and
`io::Write` traits in the standard library.
a type that implements that trait. This attribute is applied to the `Iterator`, `io::Read`,
`io::Write` and `Future` traits in the standard library.
You can do this on your own traits, like this: