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<?php class A0 { public function __toString() { return 'a0'; } }; class A1 extends A0 { public function __toString() { return 'a1'; } }; $a = function ($a) : A0 {return $a;}; echo '' . $a((new A0())), '' . $a((new A1())), '' . $a(null);;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
a0a1 Fatal error: Uncaught TypeError: {closure}(): Return value must be of type A0, null returned in /in/V1tdo:5 Stack trace: #0 /in/V1tdo(7): {closure}(NULL) #1 {main} thrown in /in/V1tdo on line 5
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 a0a1 Fatal error: Uncaught TypeError: {closure}(): Return value must be of type A0, null returned in /in/V1tdo:5 Stack trace: #0 /in/V1tdo(7): {closure}(NULL) #1 {main} thrown in /in/V1tdo 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
a0a1 Fatal error: Uncaught TypeError: Return value of {closure}() must be an instance of A0, null returned in /in/V1tdo:5 Stack trace: #0 /in/V1tdo(7): {closure}(NULL) #1 {main} thrown in /in/V1tdo on line 5
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
Parse error: syntax error, unexpected ':', expecting '{' in /in/V1tdo on line 5
Process exited with code 255.
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