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There are 13 error identifiers in the phpstanApi.* group:

• Extending or using instanceof on a PHPStan class not covered by the BC promise.

• Accessing a class constant on a PHPStan class not covered by the BC promise.

• Instantiating a PHPStan class whose constructor is not covered by the BC promise.

• Using instanceof on a PHPStan enum not covered by the BC promise.

• Referenced template type name does not exist on the specified class.

• Instanceof assumption against a PHPStan type class may break in future versions.

• Using instanceof against PHPStan Type classes is deprecated.

• Implementing a PHPStan interface not covered by the BC promise.

• Calling a PHPStan method not covered by the backward compatibility promise.

• Third-party code declares classes in the reserved PHPStan namespace.

• PHPStan extension uses runtime reflection instead of the static reflection API.

• Using a PHPStan trait not covered by the backward compatibility promise.

• Using @var to narrow a value to a specific PHPStan type class is fragile.