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<?php class Test { public function foo(self $bar){} } class Test2 { public function foo(self $bar){} } $t = new Test(); $t2 = new Test2(); $t->foo($t2);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Test::foo(): Argument #1 ($bar) must be of type Test, Test2 given, called in /in/4KdOi on line 15 and defined in /in/4KdOi:5 Stack trace: #0 /in/4KdOi(15): Test->foo(Object(Test2)) #1 {main} thrown in /in/4KdOi on line 5
Process exited with code 255.

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