Mutable environments
Note that these environments are like (interaction-environment).
(make-mutable-environment)
Returns a mutable environment.
(environment-freeze! env)
Change env to be an ordinary (immutable) environment.
The R[67]RS procedure environment accepts environments as arguments as well as library names,
thus allowing eval to work with more than one mutable environment.
- Definition in a hybrid environement: Given
(define e1 (make-environment))
(define e2 (make-environment))
(define e1+2 (environment e1 e2))
(eval '(define x 10) e1+2)
which environment is x defined in, e1 or e2, or is it an error?