[plt-scheme] full-expanded syntax and internal definitions

Dave Herman skrev:
>> No, so there no local macro definitions in fully expanded code.
> 
> If that's true then this must mean that local-expand is not guaranteed 
> to produce fully-expanded code?

Yes.

>  > (define-syntax (quote-expand stx)
>     (syntax-case stx ()
>       [(_ e)
>        (with-syntax ([exp (local-expand #'e 'expression '())])
>          #'(quote exp))]))
>  > (quote-expand (lambda ()
>                   (define-syntax foo (syntax-rules () [(_) 42]))
>                   (define y 10)
>                   y))
> (lambda () (letrec-syntaxes+values (((foo) (syntax-rules () ((_) 42)))) 
> (((y) (#%datum . 10))) y))

Compare this with the output expand which "expands all non-primitive 
syntax":

 > (syntax-object->datum
    (expand #'(lambda ()
                (define-syntax foo (syntax-rules () [(_) 42]))
                (define y 10)
                y)))
(lambda () (letrec-values (((y) (#%datum . 10))) y))

/Jens Axel