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pub trait Queue<T> { fn enqueue(&mut self, T); fn dequeue(&mut self) -> Option<T>; fn peek(&self) -> Option<&T>; fn peek_mut(&mut self) -> Option<&mut T>; }
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pub trait Queue<T> { fn enqueue(&mut self, T); fn dequeue(&mut self) -> Option<T>; fn peek(&self) -> Option<&T>; fn peek_mut(&mut self) -> Option<&mut T>; }