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<?php class A { } class B { } function foo(A $a) { var_dump($a); } $a = new A(); $b = new B(); foo($a); foo($b);
Output for git.master, git.master_jit, rfc.property-hooks
object(A)#1 (0) { } Fatal error: Uncaught TypeError: foo(): Argument #1 ($a) must be of type A, B given, called in /in/bZNvS on line 20 and defined in /in/bZNvS:12 Stack trace: #0 /in/bZNvS(20): foo(Object(B)) #1 {main} thrown in /in/bZNvS on line 12
Process exited with code 255.

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