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use syntax-track-origin when substituting identifiers

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This commit is contained in:
AlexKnauth 2016-06-10 13:27:13 -04:00
parent bf517fd99f
commit 56706c27ac
1 changed files with 10 additions and 1 deletions
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11
tapl/typecheck.rkt
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@ -756,10 +756,19 @@
(free-identifier=? #'actual #'lit))
fail-msg)
stx))])))
(define (merge-type-tags stx)
(define t (syntax-property stx 'type))
(or (and (pair? t)
(identifier? (car t)) (identifier? (cdr t))
(free-identifier=? (car t) (cdr t))
(set-stx-prop/preserved stx 'type (car t)))
stx))
; subst τ for y in e, if (bound-id=? x y)
(define (subst τ x e [cmp bound-identifier=?])
(syntax-parse e
[y:id #:when (cmp e x) (transfer-stx-props τ e)]
[y:id
#:when (cmp e x)
(transfer-stx-props τ (merge-type-tags (syntax-track-origin τ e e)))]
[(esub ...)
#:with res (stx-map (λ (e1) (subst τ x e1 cmp)) #'(esub ...))
(transfer-stx-props #'res e #:ctx e)]