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ASSERTION FAILED: oldStructure == newStructure->previousID() https://…#1663

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ASSERTION FAILED: oldStructure == newStructure->previousID() https://…#1663
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@aoikonomopoulos aoikonomopoulos commented May 5, 2026

…bugs.webkit.org/show_bug.cgi?id=282342 rdar://138178461

Reviewed by Yijia Huang and Yusuke Suzuki.

Folded the ASSERT and corresponding if into the enclosing if. Added a new test that creates the conditions that would hit the deleted ASSERT.

  • JSTests/stress/put-by-id-no-crash-interpreter.js: Added. (shouldBe):
    (createDictionary):
    (putWithSideEffects):
  • Source/JavaScriptCore/llint/LLIntSlowPaths.cpp: (JSC::LLInt::LLINT_SLOW_PATH_DECL):

Canonical link: https://commits.webkit.org/285932@main

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< bug title >
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Reviewed by NOBODY (OOPS!).

Explanation of why this fixes the bug (OOPS!).

* path/changed.ext:
(function):
(class.function):

2395876

Build-Tests Layout-Tests
✅ 🛠 wpe-238-amd64-build ⏳ 🧪 wpe-238-amd64-layout
✅ 🛠 wpe-238-arm32-build ⏳ 🧪 wpe-238-arm32-layout

…bugs.webkit.org/show_bug.cgi?id=282342 rdar://138178461

Reviewed by Yijia Huang and Yusuke Suzuki.

Folded the ASSERT and corresponding *if* into the enclosing *if*.  Added a new test that creates the conditions
that would hit the deleted ASSERT.

* JSTests/stress/put-by-id-no-crash-interpreter.js: Added.
(shouldBe):
(createDictionary):
(putWithSideEffects):
* Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):

Canonical link: https://commits.webkit.org/285932@main
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