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<?php interface TestInterface { public function test(): TestInterface; } trait TestTrait { public function test(): TestInterface { return $this; } } class TestClass implements TestInterface { use TestTrait; public function test2() : self { return $this; } } class TestClass2 extends TestClass {} $test = new TestClass; $test2 = new TestClass2; var_dump($test->test(), $test2->test2());
Output for git.master, git.master_jit, rfc.property-hooks
object(TestClass)#1 (0) { } object(TestClass2)#2 (0) { }

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