[plt-scheme] redefinition with #lang scheme

From: Skeptic . (skeptic2000 at hotmail.com)
Date: Fri Apr 2 11:58:58 EDT 2010

I know that the following code works on the REPL, but why/how it should be done to work with #lang scheme ?
(define old-car car)
(define car (λ (lst)   (if (null? lst)  '()  (old-car lst))))
(car '())(car '(a b  c))
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