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; Part of Scheme 48 1.9. See file COPYING for notices and license.
; Authors: Mike Sperber
; Low-level support for different kinds of syntax transformers
; We just use a vector with a tag in slot 0. (Can't be a pair,
; because syntax transformers may be pairs of transformer and aux
; names.)
; 4-argument version of explicit-renaming transformers
; (expression name? rename compare)
(define (make-explicit-renaming-transformer/4 proc)
(vector 'explicit-renaming-transformer/4 proc))
(define (explicit-renaming-transformer/4? thing)
(and (vector? thing)
(= 2 (vector-length thing))
(eq? 'explicit-renaming-transformer/4 (vector-ref thing 0))))
(define (explicit-renaming-transformer/4-proc thing)
(vector-ref thing 1))
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