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Do not accumulate free vars from our local (let)'s

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Justin Ethier 2018-11-14 18:22:51 -05:00
parent ef647082e6
commit a06d2793c8
1 changed files with 8 additions and 1 deletions
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9
scheme/cyclone/transforms.sld
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@ -623,6 +623,7 @@
; free-vars : exp -> sorted-set[var]
(define (free-vars ast . opts)
(define let-vars '())
(define bound-only?
(and (not (null? opts))
(car opts)))
@ -636,7 +637,10 @@
((const? exp) '())
((prim? exp) '())
((quote? exp) '())
((ref? exp) (if bound-only? '() (list exp)))
((ref? exp)
(if (member exp let-vars)
'()
(if bound-only? '() (list exp))))
((lambda? exp)
(difference (reduce union (map search (lambda->exp exp)) '())
(lambda-formals->list exp)))
@ -648,6 +652,9 @@
((define-c? exp) (list (define->var exp)))
((set!? exp) (union (list (set!->var exp))
(search (set!->exp exp))))
((tagged-list? 'let exp)
(set! let-vars (append (map car (cadr exp)) let-vars))
(search (cdr exp)))
; Application:
((app? exp) (reduce union (map search exp) '()))
(else (error "unknown expression: " exp))))