Module Univ_map.Multi

list-accumulating keys with a default value of the empty list

module Key : sig ... end
val set : t -> 'a Key.t -> 'a Base.List.t -> t
val find : t -> 'a Key.t -> 'a Base.List.t
val add : t -> 'a Key.t -> 'a -> t
val change : t -> 'a Key.t -> f:('a Base.List.t -> 'a Base.List.t) -> t