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psalm/docs/running_psalm/issues/MutableDependency.md

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# MutableDependency
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Emitted when an immutable class inherits from a class or trait not marked @psalm-immutable
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```php
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<?php
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class MutableParent {
public int $i = 0;
public function increment() : void {
$this->i++;
}
}
/**
* @psalm-immutable
*/
final class NotReallyImmutableClass extends MutableParent {}
```