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use Poll;
use stream::Stream;
#[must_use = "streams do nothing unless polled"]
pub struct MapErr<S, F> {
stream: S,
f: F,
}
pub fn new<S, F, U>(s: S, f: F) -> MapErr<S, F>
where S: Stream,
F: FnMut(S::Error) -> U,
{
MapErr {
stream: s,
f: f,
}
}
impl<S, F, U> Stream for MapErr<S, F>
where S: Stream,
F: FnMut(S::Error) -> U,
{
type Item = S::Item;
type Error = U;
fn poll(&mut self) -> Poll<Option<S::Item>, U> {
self.stream.poll().map_err(&mut self.f)
}
}