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<?php class Base { public static function test(self $obj) : self { echo get_class($obj) . "\n"; if (!$obj instanceof static) { throw new InvalidArgumentException(sprintf( "Object (%s) must be an instance of %s", get_class($obj), static::class )); } return new static($obj); } } class Ext extends Base {} $base = new Base; $ext = new Ext; Base::test($base); Base::test($ext); Ext::test($ext); Ext::test($base);
Output for git.master, git.master_jit, rfc.property-hooks
Base Ext Ext Base Fatal error: Uncaught InvalidArgumentException: Object (Base) must be an instance of Ext in /in/Tp7k6:8 Stack trace: #0 /in/Tp7k6(28): Base::test(Object(Base)) #1 {main} thrown in /in/Tp7k6 on line 8
Process exited with code 255.

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