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psalm/docs/running_psalm/issues/ImplementationRequirementViolation.md

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# ImplementationRequirementViolation
Emitted when a using class of a trait does not implement all interfaces specified using `@psalm-require-implements`.
```php
<?php
interface A { }
interface B { }
/**
* @psalm-require-implements A
* @psalm-require-implements B
*/
trait T { }
class C {
// ImplementationRequirementViolation is emitted, as T requires
// the using class C to implement A and B, which is not the case
use T;
}
```