36 lines
899 B
Racket
36 lines
899 B
Racket
#lang scheme/base
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;; Help Desk binding info:
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(define (binding binder bound stx)
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stx
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;; This 'bound-in-source is no longer needed
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#;
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(syntax-property
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stx
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'bound-in-source
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(cons binder (syntax-local-introduce bound))))
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(define (make-id-mapper unbox-stx the-binder)
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(let ([set!-stx (datum->syntax unbox-stx 'set! #f)])
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(make-set!-transformer
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(lambda (sstx)
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(cond
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[(identifier? sstx)
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(binding the-binder sstx
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unbox-stx)]
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[(free-identifier=? set!-stx (car (syntax-e sstx)))
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(raise-syntax-error
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'unit
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"cannot set! imported or exported variables"
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sstx)]
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[else
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(binding
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the-binder (car (syntax-e sstx))
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(datum->syntax
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sstx
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(cons unbox-stx (cdr (syntax-e sstx)))
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sstx))])))))
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(provide make-id-mapper)
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