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use filter::Filter;
#[must_use = "filters are lazy and do nothing unless consumed"]
#[derive(Clone)]
pub struct Not<T> {
a: T
}
impl<T> Not<T> {
pub fn new(a: T) -> Not<T> {
Not { a: a }
}
}
impl<I, T: Filter<I>> Filter<I> for Not<T> {
fn filter(&self, e: &I) -> bool {
!self.a.filter(e)
}
}
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