Fix phpstan/phpstan#13023: function.alreadyNarrowedType and function.impossibleType after updates to 2.1.15#5184

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Commits on Mar 14, 2026

Fix false positives for is_a() and instanceof checks on $this in traits

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VincentLanglet
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Generalize trait $this check to cover property fetches and method calls

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claude
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Handle static access, nullsafe access, and $this:: in trait $this check

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claude
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Fix BooleanNot false positive for $this-dependent checks in traits

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Move isExpressionDependentOnThis to ExpressionDependsOnThisHelper

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Fix method_exists($this) false positives in traits and PHP 7.4 lint

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Add regression tests for trait-related false positives

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Still report method_exists($this) as always true when method is defined in the trait

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Extend trait context detection to cover self-typed variables and fix multiple method names

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Fix lint errors and skip testBug7599 on PHP < 8.1

phpstan-bot
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claude
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Add regression test for phpstan/phpstan#12798

phpstan-bot
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claude
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Add test
VincentLanglet
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Rework
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Simplify
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Remove dedicated class
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Fix test
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