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core: Stabilize FusedIterator

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FusedIterator is a marker trait that promises that the implementing
iterator continues to return `None` from `.next()` once it has returned
`None` once (and/or `.next_back()`, if implemented).

The effects of FusedIterator are already widely available through
`.fuse()`, but with stable `FusedIterator`, stable Rust users can
implement this trait for their iterators when appropriate.
This commit is contained in:
Ulrik Sverdrup 2018-01-15 19:59:10 +01:00
parent c9b86a9178
commit bc651cac8d
28 changed files with 110 additions and 114 deletions
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4
src/liballoc/vec.rs
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@ -2389,7 +2389,7 @@ impl<T> ExactSizeIterator for IntoIter<T> {
}
}
#[unstable(feature = "fused", issue = "35602")]
#[stable(feature = "fused", since = "1.25.0")]
impl<T> FusedIterator for IntoIter<T> {}
#[unstable(feature = "trusted_len", issue = "37572")]
@ -2495,7 +2495,7 @@ impl<'a, T> ExactSizeIterator for Drain<'a, T> {
}
}
#[unstable(feature = "fused", issue = "35602")]
#[stable(feature = "fused", since = "1.25.0")]
impl<'a, T> FusedIterator for Drain<'a, T> {}
/// A place for insertion at the back of a `Vec`.