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<Putonlalla>
I'm trying to simplify a `syntax-case` macro by making some of its clauses recursive. I used the macro stepper to check that the result looks correct. However, it still gives me an `unbound identifier` error. What am I not taking into account?
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<samth>
Putonlalla: it's hard to know without looking at your code
<Putonlalla>
I figured that might be the case, but it's a bit of a mess, so I was hoping I wouldn't have to minimize it.
<Putonlalla>
I can do so soon, but here's the gist of it.
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<Putonlalla>
If I write `(define-syntax (generate stx) (syntax-case stx () ((_ (the rest ...) def) #;(generating some definitions using with-syntax)) ((_ (the rest ...)) #;(generating the same definitions except with some def set to some-value))))`, everything works.
<Putonlalla>
However, if I write `(define-syntax (generate stx) (syntax-case stx () ((_ (the rest ...) def) #;(generating some definitions using with-syntax)) ((_ (the rest ...)) (syntax (generate (the rest ...) some-value)))))`, everything breaks mysteriously.
<Putonlalla>
To my inexperienced eye, these two definitions should behave exactly the same.
<samth>
Putonlalla: if you're binding an identifier in one step and then generating the reference in the second step then it won't work
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<Putonlalla>
I think I noticed that. Why, though?
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<samth>
Putonlalla: what hygiene amounts to (in part) is that identifiers created by a particular step of macro expansion don't capture (bind) identifiers from other steps of macro expansion
<samth>
there's no special connection between two different uses of the same macro
<Putonlalla>
Oh, I see. It's just that.
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