On Sep 16, 2012, at 5:48 PM, Ryan Culpepper wrote: > See 'define-template-metafunction' in syntax/parse/experimental/template. > Remember to change the relevant occurrences of 'syntax' to 'template'.
Neat! I'm guessing, though, that I probably shouldn't release planet packages that depend on experimental-mumble… John > > Ryan > > On 09/16/2012 08:31 PM, John Clements wrote: >> 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 >> >> >> >> >> _________________________ >> Racket Developers list: >> http://lists.racket-lang.org/dev >> >
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