You can search for identifiers within the package.
in-package search v0.2.0
val add : string -> float -> arit_env -> arit_env
val mem : string -> arit_env -> bool
val union : arit_env -> arit_env -> arit_env
val of_list : (string * float) list -> arit_env
val empty : arit_env
val usual : arit_env