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Do not crash when a closure unsets a variable it captured by reference - #12022
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`function () use (&$x) { unset($x); }` crashed with an undefined array key when the variable's type after the closure was computed.
Co-Authored-By: Claude Opus 5.5
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…ence Co-Authored-By: Claude Opus 5.5
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function () use (&$x) { unset($x); }crashed with an undefined array key when the variable's type after the closure was computed.Split out of #12013.
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