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psalm/docs/running_psalm/issues/UnusedClass.md

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# UnusedClass
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Emitted when `--find-dead-code` is turned on and Psalm cannot find any uses of a
given class.
If this class is used and part of the public API, annotate it with `@psalm-api`.
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```php
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<?php
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class A {}
class B {}
$a = new A();
```