On 2012-03-04, at 11:22 AM, Álvaro Castro-Castilla wrote:
Marc,
I see. The only reason I miss syntax-rules is for some SRFIs and libs like Kanren, completely implemented as syntax-rules. Otherwise I'm happier with define-macro :)
Thanks for your reply
By the way, I should have mentionned in my previous message that when using the -:s switch, you still have access to ##lambda which does support DSSSL parameter lists. The form ##lambda has the same syntax as lambda, but it is not under the control of the psyntax expander (which defines lambda as a macro).
So you can do this:
% gsi -:s Gambit v4.6.4
(define f (lambda (a b #!optional (c (+ a b)) #!rest d) (list a b c d)))
*** ERROR -- invalid parameter list in (lambda (a b #!optional (c (+ a b)) #!rest d) (list a b c d))
(define f (##lambda (a b #!optional (c (+ a b)) #!rest d) (list a b c d))) (f 0 1 2 3 4)
(0 1 2 (3 4))
(define f (##lambda (a b #!key (c (+ a b)) #!rest d) (list a b c d))) (f 11 22)
(11 22 33 ())
(f 11 22 c: 99)
*** ERROR IN (console)@6.10 -- Unbound variable: c: 1>
(f 11 22 (string->keyword "c") 99)
(11 22 99 ())
(define c: (string->keyword "c")) (f 11 22 c: 99)
(11 22 99 ())
Marc