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Lalo Martins wrote: > ..... > But how can I get a closed environment object to work with? So > that, for example > (define foo 1) > (local-eval '(define foo 2) env) > would leave foo as 1 outside env? Just create a new scope (for example with let): (define env (let () (the-environment))) (define foo 1) (local-eval '(define foo 2) env) (display foo) (newline) (local-eval '(display foo) env) (newline) which gives: 1 2 Is that what you want? Alex