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Added regression test #4310

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Merged
merged 1 commit into from
Sep 9, 2025
Merged

Added regression test #4310

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11 changes: 11 additions & 0 deletions tests/PHPStan/Rules/Classes/ImpossibleInstanceOfRuleTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -556,4 +556,15 @@ public function testNewIsAlwaysFinalClass(): void
]);
}

public function testBug13469(): void
{
$this->treatPhpDocTypesAsCertain = false;
$this->analyse([__DIR__ . '/data/bug-13469.php'], [
[
'Instanceof between Bug13469\Foo and Stringable will always evaluate to true.',
23,
],
]);
}

}
25 changes: 25 additions & 0 deletions tests/PHPStan/Rules/Classes/data/bug-13469.php
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
<?php

namespace Bug13469;

use Stringable;

trait FooTrait
{
public function __toString(): string
{
return 'foo';
}
}

class Foo
{
use FooTrait;
}

function doFoo() {
$foo = new Foo();

var_dump($foo instanceof Stringable);
}

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