I want to apply a transformation to a nested pattern element. To start with, suppose I have a (kind of useless) with-handlers that looks like this:
(with-syntax
([((arg ...) ...)
#`((clause.input ...) ...)])
et-cetera)
That is, I've basically just renamed "clause.input" to "arg".
But now, I want to perform some transformation on the elements. I'd like to
write this:
(with-syntax
([((arg ...) ...)
#`((#,(transform #'clause.input) ...) ...)])
et-cetera)
.. but this fails, with the error "new-style-signals.rkt:42:30: syntax: missing
ellipsis with pattern variable in template in: clause.input"
I can certainly work around this, by abandoning the pattern-matching slickness
and just using a bunch of syntax->lists, but it seems like there must be a
nicer way. Am I missing some nifty trick?
John
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