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There are 10 error identifiers in the requireExtends.* group:

• @phpstan-require-extends references a deprecated class.

• Multiple @phpstan-require-extends tags on the same declaration.

• @phpstan-require-extends references an enum, which cannot be extended.

• @phpstan-require-extends references a final class, which cannot be extended.

• @phpstan-require-extends references an interface instead of a class.

• @phpstan-require-extends references an internal class.

• @phpstan-require-extends contains a non-object type instead of a class.

• @phpstan-require-extends is placed on a class where it has no effect.

• @phpstan-require-extends is placed on an enum where it has no effect.

• Tag @phpstan-require-extends references a trait instead of a class.