Hi Racket experts,
I am reading SICP and trying this piece of code using Racke:
(define (definition-value exp)
(if (symbol? (cadr exp))
(caddr exp)
(make-lambda
(cdadr exp) ; formal parameters
(cddr exp) ; body
)
)
)
(define (make-lambda parameters body)
(cons 'lambda (cons parameters body))
)
( (eval (definition-value '(define (double x) (+ x x))) ) 10)
In REPL, it return 20 with no problem.
However, if I put it into a file and use racket command to run it (with
#lang scheme in the file)
it complains:
compile: unbound identifier (and no #%app syntax transformer is bound) at:
lambda in: (lambda (x) (+ x x))
Do you have any idea what happened there? How can I solve this problem?
Thanks,
Alfred
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