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<?php class Foo extends DateTime { function add(DateInterval $interval){ parent::add($interval); } }
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of Foo::add(DateInterval $interval) should either be compatible with DateTime::add(DateInterval $interval): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/oh0uT on line 4

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