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psalm/docs/running_psalm/issues/InvalidTemplateParam.md

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# InvalidTemplateParam
Emitted when using the `@extends`/`@implements` annotation to extend a class that has a template type constraint, where that extended value does not satisfy the parent class/interface's constraints.
```php
<?php
/**
* @template T of object
*/
class Base {}
/** @template-extends Base<int> */
class SpecializedByInheritance extends Base {}
```