Class Ppxlib_traverse_builtins.fold
method int : (int, 'acc0) T.foldmethod string : (string, 'acc1) T.foldmethod bool : (bool, 'acc2) T.foldmethod char : (char, 'acc3) T.foldmethod option : 'a. ('a, 'acc4) T.fold -> ('a option, 'acc4) T.foldmethod list : 'a. ('a, 'acc5) T.fold -> ('a list, 'acc5) T.foldmethod array : 'a. ('a, 'acc6) T.fold -> ('a array, 'acc6) T.fold