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<?php class test {} function test(): \stdClass { return new test(); } test();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught TypeError: test(): Return value must be of type stdClass, test returned in /in/ZmgTg:5 Stack trace: #0 /in/ZmgTg(8): test() #1 {main} thrown in /in/ZmgTg on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of test() must be an instance of stdClass, instance of test returned in /in/ZmgTg:5 Stack trace: #0 /in/ZmgTg(8): test() #1 {main} thrown in /in/ZmgTg on line 5
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.26
Parse error: syntax error, unexpected ':', expecting '{' in /in/ZmgTg on line 4
Process exited with code 255.

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