Part of the problem is that you are running your program within a module.
Unless a variable x is explicitly designated as assignable via (set! x ...),
the execution of a module makes the variable immutable. You can see how it
all gets expanded with the macro stepper (disable hiding):
(module
Hello, Racket users!
Here is an example I difficultly understand:
#lang scheme
(define saved '*dummy-value*)
(define next-year (+ 1 (call/cc (lambda (g) (set! saved g) 1997
(saved 2012)
In some other interpreters, it is OK. But Racket's answer is:
define-values: cannot re-define a
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