Operations on tuples
first - Return the first element of a pairsecond - Return the second element of a pairswap - Return the results of swapping the two elements of a pairfirstpure fn first<T: copy, U: copy>(pair: (T, U)) -> TReturn the first element of a pair
secondpure fn second<T: copy, U: copy>(pair: (T, U)) -> UReturn the second element of a pair
swappure fn swap<T: copy, U: copy>(pair: (T, U)) -> (U, T)Return the results of swapping the two elements of a pair