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On Fri, 26 Mar 2004, Alex Shinn wrote: > ... and both versions are easier to read if you actually include the > "and" in the LHS, sorry about that: > > (define-syntax-computations and () > (and) #f > (and x) x > (and x y z ...) (if x (and y z ...) #f)) I agree that this is more readable. However, there may be some value in mirroring the syntax-rules bracketing, if only to avoid confusion by those familiar with the latter. One rationale for the current decoupling of the defining form from the transformer (as in syntax-rules) is that one has a uniform way of denoting a transformer, whether it is bound to a name using define-syntax, bound using let(rec)-syntax, or used anonymously. Your proposal, while more brief, conflates declaring the transformer and binding it, and only in define forms but not let(rec)-forms - in the latter you still have to write it out the long way. I have another idea: instead of using define-syntax, introduce a form DEFINE-TRANSFORMER which will handle both syntax-rules and syntax-computations, and which can be portable extended to handle other kinds of tranformers should the need arise in future. So one would write (define-transformer name (syntax-rules (...) ...)) (define-transformer name (syntax-computations (...) ...)) (define-transformer name (lambda (stx) (syntax-case stx (...) ...) and so on. The same goes for LET-TRANSFORMER and LETREC-TRANSFORMER. Regards Andre