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* Prevent invalid Traversable implementation

Fixes vimeo/psalm#5167

* Document new issue

* CS fix

2021-02-06 22:10:05 -05:00

InvalidTraversableImplementation

Emitted when class incorrectly implements Traversable. Traversable needs to be implemented by implementing either IteratorAggregate or Iterator

<?php

final class C implements Traversable {} // will cause fatal error