@4c603b88 @c39d2605 @462ebf4c @338f82ef 

it won't update setted variable's value in all procedures of `(X)` that uses `x`. `(define (square r pi) (* r r pi))` <-- here pi will stay 3.14 when `square` will be called from `(Y)` 

 @4c603b88 @c39d2605 @462ebf4c @338f82ef probably the answer given was toatally correct. set! and stuff will work in repl, but won't when launched in the testing env that I just set up. 

 @4c603b88 @c39d2605 @462ebf4c @338f82ef 

yep. the problem was totally in the testing env