environment.mli

   1 open Types;;
   2 module Environment :
   3 sig
   4   val push_env_frame : scheme_environment -> symbol list -> scheme_object list -> scheme_environment
   5   val lookup : scheme_environment -> string -> scheme_object
   6   val update : scheme_environment -> string -> scheme_object -> unit
   7   val current_env_frame : scheme_environment -> environment_frame
   8   val initial_env : scheme_environment
   9 end