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<?php class Foo { public function test( self $arg = null ){ echo get_class( $arg ) . "\n"; echo is_null( $arg ) . "\n"; var_dump( $arg instanceof Foo ) . "\n"; } } $foo = new Foo(); $foo->test();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: get_class(): Argument #1 ($object) must be of type object, null given in /in/LepeB:5 Stack trace: #0 /in/LepeB(13): Foo->test() #1 {main} thrown in /in/LepeB on line 5
Process exited with code 255.

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