accessor

A library that makes it nicer to work with nested functional data structures
IN THIS PACKAGE
val map : ( 'a, 'e ) B.t -> f:( 'a -> 'b ) -> ( 'b, 'e ) B.t
val both : ( 'a, 'e ) B.t -> ( 'b, 'e ) B.t -> ( 'a * 'b, 'e ) B.t
module Open_on_rhs : sig ... end