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Remove Send from ValueDrain iterator #361

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Remove Send from ValueDrain iterator #361

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10 changes: 6 additions & 4 deletions src/header/map.rs
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Expand Up @@ -3030,8 +3030,10 @@ impl<'a, T> Drop for ValueDrain<'a, T> {
}
}

unsafe impl<'a, T: Sync> Sync for ValueDrain<'a, T> {}
unsafe impl<'a, T: Send> Send for ValueDrain<'a, T> {}
// `ValueDrain` cannot be `Send` because it has un-synchronized mutation of
// the `extra_values` vector.
//
// See https://github.com/hyperium/http/issues/355

// ===== impl RawLinks =====

Expand Down Expand Up @@ -3399,7 +3401,7 @@ mod as_header_name {

#[test]
fn test_bounds() {
fn check_bounds<T: Send + Send>() {}
fn check_bounds<T: Send + Sync>() {}

check_bounds::<HeaderMap<()>>();
check_bounds::<Iter<'static, ()>>();
Expand All @@ -3414,7 +3416,7 @@ fn test_bounds() {
check_bounds::<OccupiedEntry<'static, ()>>();
check_bounds::<ValueIter<'static, ()>>();
check_bounds::<ValueIterMut<'static, ()>>();
check_bounds::<ValueDrain<'static, ()>>();
// cannot: ValueDrain<'static, ()>
}

#[test]
Expand Down