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Clarify edge cases for Barrier::new #149236

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Clarify edge cases for Barrier::new #149236

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2 changes: 2 additions & 0 deletions library/std/src/sync/barrier.rs
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Expand Up @@ -68,6 +68,8 @@ impl Barrier {
/// A barrier will block `n`-1 threads which call [`wait()`] and then wake
/// up all threads at once when the `n`th thread calls [`wait()`].
///
/// If `n` is 0, the barrier acts the same as `n` is 1.
///
/// [`wait()`]: Barrier::wait
///
/// # Examples
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