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<?php function test(): callable { return ''; } test();
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: test(): Return value must be of type callable, string returned in /in/ClpId:4 Stack trace: #0 /in/ClpId(7): test() #1 {main} thrown in /in/ClpId on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 test() must be callable, string returned in /in/ClpId:4 Stack trace: #0 /in/ClpId(7): test() #1 {main} thrown in /in/ClpId on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/ClpId on line 3
Process exited with code 255.

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