On Fri 24 Feb 2012 13:53, Jussi Piitulainen <jpiitula@x> writes:
> Implementations can do anything they like when the report says "it is
> an error".
Implementations can do whatever they like, in general ;-)
But consider:
(define t 1)
(let ()
(define-syntax define-const
(syntax-rules ()
((_ var val)
(begin
(define t val)
(define (var) t)))))
(define-const foo 2)
t)
In Scheme, this must evaluate to 1. I think all implementations support
this.
Now consider:
(define t 1)
(define-syntax define-const
(syntax-rules ()
((_ var val)
(begin
(define t val)
(define (var) t)))))
(define-const foo 2)
t
Does Scheme consider it a goal to specify the result of this program?
Andy
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