RESOLVED FIXED 289430
[JSC] `Set#union` and `Set#synmmetric` should get `next` before cloning `this` 
https://bugs.webkit.org/show_bug.cgi?id=289430
Summary [JSC] `Set#union` and `Set#synmmetric` should get `next` before cloning `this`
Sosuke Suzuki
Reported 2025-03-09 07:32:55 PDT
According to the spec[1][2], `Set#symmetricDifference` and `Set#union` get keys iterator's `next` method via `GetIteratorFromMethod`[3] and `GetIteratorDirect`[4] before cloning `this`. However, the current JSC implementation don't get it. Getting `next` method can occur observable side effects, so we need to fix it. [1]: https://tc39.es/ecma262/#sec-set.prototype.symmetricdifference [2]: https://tc39.es/ecma262/#sec-set.prototype.union [3]: https://tc39.es/ecma262/#sec-getiteratorfrommethod [4]: https://tc39.es/ecma262/#sec-getiteratordirect
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Sosuke Suzuki
Comment 1 2025-03-09 07:34:13 PDT
Pull request: https://github.com/WebKit/WebKit/pull/42158
EWS
Comment 2 2025-03-09 20:16:40 PDT
Committed 291875@main (b07e269b5a00): <https://commits.webkit.org/291875@main> Reviewed commits have been landed. Closing PR #42158 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2025-03-09 20:17:13 PDT
<rdar://problem/146627064>
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