You can search for identifiers within the package.
in-package search v0.2.0
type 'a error_or = ('a, string) Result.result
val (>>=) : 'a error_or -> ('a -> 'b error_or) -> 'b error_or
val (>|=) : 'a error_or -> ('a -> 'b) -> 'b error_or
val map_bind : ('a -> 'b error_or) -> 'b list -> 'a list -> 'b list error_or
module List : module type of Stdlib.List
module String : module type of Stdlib.String
module Bytes : module type of Stdlib.Bytes
module Int32 : module type of Stdlib.Int32
module Int64 : module type of Stdlib.Int64
module Nativeint : module type of Stdlib.Nativeint
module Array : module type of Stdlib.Array
module Result : sig ... end