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psalm/docs/running_psalm/issues/InvalidTraversableImplementation.md
Bruce Weirdan 04bb2b1182
Prevent invalid Traversable implementation (#5171)
* Prevent invalid Traversable implementation

Fixes vimeo/psalm#5167

* Document new issue

* CS fix
2021-02-06 22:10:05 -05:00

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Markdown

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