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Make iter::Empty<T> implement Send and Sync for any T

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This commit is contained in:
Konrad Borowski 2020-01-18 18:35:36 +01:00
parent 8c28fe89c7
commit a70b240189
1 changed files with 5 additions and 0 deletions
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5
src/libcore/iter/sources.rs
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@ -208,6 +208,11 @@ pub fn repeat_with<A, F: FnMut() -> A>(repeater: F) -> RepeatWith<F> {
#[stable(feature = "iter_empty", since = "1.2.0")]
pub struct Empty<T>(marker::PhantomData<T>);
#[stable(feature = "iter_empty_send_sync", since = "1.42.0")]
unsafe impl<T> Send for Empty<T> {}
#[stable(feature = "iter_empty_send_sync", since = "1.42.0")]
unsafe impl<T> Sync for Empty<T> {}
#[stable(feature = "core_impl_debug", since = "1.9.0")]
impl<T> fmt::Debug for Empty<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {