swap
Lib.swap : 'a * 'b -> 'b * 'a
Swaps the two components of a pair.
swap (x,y) returns (y,x).
swap (x,y)
(y,x)
Never fails.
Lib.fst, Lib.snd, Lib.pair, Lib.rpair
Lib.fst
Lib.snd
Lib.pair
Lib.rpair