val return : 'a -> ('a, 'd, 'e) X.t
include Base__.Monad_intf.Infix_indexed with type ('a, 'i, 'j) t := ('a, 'd, 'e) X.t
val (>>=) : ('a, 'd, 'e) X.t -> ('a -> ('a, 'd, 'e) X.t) -> ('a, 'd, 'e) X.tval (>>|) : ('a, 'd, 'e) X.t -> ('a -> 'b) -> ('a, 'd, 'e) X.t