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TrustedLen for Empty and Once. #38713

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Merged
bors merged 1 commit into from
Jan 1, 2017
Merged

TrustedLen for Empty and Once. #38713

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8 changes: 7 additions & 1 deletion src/libcore/iter/sources.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ use fmt;
use marker;
use usize;

use super::FusedIterator;
use super::{FusedIterator, TrustedLen};

/// An iterator that repeats an element endlessly.
///
Expand Down Expand Up @@ -138,6 +138,9 @@ impl<T> ExactSizeIterator for Empty<T> {
}
}

#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<T> TrustedLen for Empty<T> {}

#[unstable(feature = "fused", issue = "35602")]
impl<T> FusedIterator for Empty<T> {}

Expand Down Expand Up @@ -216,6 +219,9 @@ impl<T> ExactSizeIterator for Once<T> {
}
}

#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<T> TrustedLen for Once<T> {}

#[unstable(feature = "fused", issue = "35602")]
impl<T> FusedIterator for Once<T> {}

Expand Down