split : ('a * 'b) list -> ('a list * 'b list)
STRUCTURE
SYNOPSIS
Converts a list of pairs into a pair of lists.
DESCRIPTION
split [(x1,y1),...,(xn,yn)] returns ([x1,...,xn],[y1,...,yn]).
FAILURE
Never fails.
COMMENTS
Identical to the Basis function ListPair.unzip and the function Lib.unzip.
SEEALSO
HOL  Kananaskis-14