Rollup merge of #58606 - stjepang:put-future-into-spotlight, r=alexcrichton
Docs: put Future trait into spotlight If a function returns a type that implements `Future`, there should be a small "i" symbol next to it indicating the return type implements an important trait.
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@ -24,6 +24,7 @@ use task::{Poll, Waker};
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///
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/// When using a future, you generally won't call `poll` directly, but instead
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/// `await!` the value.
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#[doc(spotlight)]
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#[must_use = "futures do nothing unless polled"]
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pub trait Future {
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/// The type of value produced on completion.
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