Hi guys,
I’ve been trying to figure out the syntax for a guard when the pattern has
ellipsis and you want to guard one of the variables. Here’s an uninteresting
macro but it shows what I mean.
#lang racket
(define-syntax (foo stx)
(syntax-case stx ()
[(_ (key val ...) ...)
(and (identifier? #'key) (identifier? #'val))
#'(quote (list ((quote key) (quote val) ...) ...))]))
(foo (a b) (c d e))
Of course it complains about the ellipsis being missing in the pattern. Is this
something I can handle with a guard in this manner or do I need a helper macro
of some sort?
Thanks!
Kevin
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