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Fix set-symmetric-difference when passed the same set multiple times.

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Closes #1403.
This commit is contained in:
Vincent St-Amour 2016-08-03 13:02:14 -05:00
parent b3b16b36a1
commit 4716a6eb00
2 changed files with 4 additions and 2 deletions
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3
pkgs/racket-test-core/tests/racket/set.rktl
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@ -139,6 +139,9 @@
'set-symmetric-difference/list
'(1 3))
(test #t equal? (set) (let ([a (set 1 2 3)]) (set-symmetric-difference a a)))
(test #t equal? (set) (let ([a (set 1 2 3)] [b (set 1 2 3)]) (set-symmetric-difference a b)))
(let ([s (set 1 2 3)])
(test #t equal? s (set-add (set-add (set-add (set) 1) 2) 3))
(test #t equal? (seteq 1 2 3) (seteq 1 2 3))

3
racket/collects/racket/private/set-types.rkt
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@ -186,8 +186,7 @@
s
(for/fold
([table (custom-set-table largest-immutable)])
([s2 (in-list (cons s sets))]
#:unless (eq? s2 largest-immutable))
([s2 (in-list (remove largest-immutable (cons s sets)))])
(for/fold ([table table]) ([x (in-hash-keys (custom-set-table s2))])
(if (hash-ref table x #f)
(hash-remove table x)