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Make iter::Empty<T> Send and Sync for any T #68348

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Jan 19, 2020
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Make iter::Empty<T> Send and Sync for any T #68348

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a70b240
Make iter::Empty<T> implement Send and Sync for any T
KamilaBorowska Jan 18, 2020
d7a18f8
Add a test for iter::empty::<*mut i32> being Sync and Send
KamilaBorowska Jan 16, 2019
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5 changes: 5 additions & 0 deletions src/libcore/iter/sources.rs
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Expand Up @@ -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 {
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1 change: 1 addition & 0 deletions src/test/ui/threads-sendsync/sync-send-iterators-in-libcore.rs
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Expand Up @@ -88,6 +88,7 @@ fn main() {
is_sync_send!((1..));
is_sync_send!(repeat(1));
is_sync_send!(empty::<usize>());
is_sync_send!(empty::<*mut i32>());
is_sync_send!(once(1));

// for option.rs
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