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<?php class A { function foo() : A { } } $a = new A; $a->foo();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: A::foo(): Return value must be of type A, none returned in /in/8F0Z0:8 Stack trace: #0 /in/8F0Z0(12): A->foo() #1 {main} thrown in /in/8F0Z0 on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of A::foo() must be an instance of A, none returned in /in/8F0Z0:8 Stack trace: #0 /in/8F0Z0(12): A->foo() #1 {main} thrown in /in/8F0Z0 on line 8
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/8F0Z0 on line 5
Process exited with code 255.

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