13.3 REPL Environment
— procedure: nearest-repl/environment
Returns the current REP loop environment (i.e. the current
environment of the closest enclosing REP loop). When Scheme
first starts up, this is the same as
— procedure: ge environment
Changes the current REP loop environment to environment.
Environment can be either an environment or a procedure object.
If it's a procedure, the environment in which that procedure was closed
is the new environment.