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psalm/docs/running_psalm/issues/InvalidTraversableImplementation.md

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# InvalidTraversableImplementation
Emitted when class incorrectly implements Traversable. Traversable needs to be
implemented by implementing either `IteratorAggregate` or `Iterator`
```php
<?php
/**
* @implements Traversable<mixed, mixed>
*/
final class C implements Traversable {} // will cause fatal error
```