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psalm/docs/running_psalm/issues/ExtensionRequirementViolation.md

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# ExtensionRequirementViolation
Emitted when a using class of a trait does not extend the class specified using `@psalm-require-extends`.
```php
<?php
class A { }
/**
* @psalm-require-extends A
*/
trait T { }
class B {
// ExtensionRequirementViolation is emitted, as T requires
// the using class B to extend A, which is not the case
use T;
}
```