pub trait CopyableTuple<T, U> {
fn first(&self) -> T;
fn second(&self) -> U;
fn swap(&self) -> (U, T);
}Method extensions to pairs where both types satisfy the Clone bound
fn first(&self) -> TReturn the first element of self
fn second(&self) -> UReturn the second element of self
fn swap(&self) -> (U, T)Return the results of swapping the two elements of self
impl<T: Clone, U: Clone> CopyableTuple<T, U> for (T, U)
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