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cs: fix mark-table-prune

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Fix the case when the list of marks to remove is empty,
and also change the order of the arguments.
This commit is contained in:
Gustavo Massaccesi 2018-07-20 09:29:15 -03:00
parent 859ead9cc3
commit ebb7c0ea82
1 changed files with 5 additions and 10 deletions
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15
racket/src/cs/rumble/control.ss
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@ -827,15 +827,10 @@
(define (mark-table-prune a b)
(cond
[(null? a) b]
[(null? a) '()]
[(null? b) a]
[else
(let loop ([b b] [a a])
(cond
[(null? a) b]
[else (let ([p (car a)])
(loop (mark-table-remove b (car p))
(cdr a)))]))]))
[else (mark-table-prune (mark-table-remove a (caar b))
(cdr b))]))
(define (mark-table->hash mt)
(let loop ([ht empty-hasheq] [mt mt])
@ -1034,8 +1029,8 @@
[(and (not prev) (eq? (mark-stack-frame-k mark-stack) empty-k))
(make-mark-stack-frame #f
empty-k
(mark-table-prune (mark-stack-frame-table mark-stack)
(mark-stack-frame-table mark-splice))
(mark-table-prune (mark-stack-frame-table mark-splice)
(mark-stack-frame-table mark-stack))
#f)]
[else (loop prev)]))]))]))