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<?php function foo(mixed $arg): mixed { echo 'foo'; } foo('arg');
Output for git.master, git.master_jit, rfc.property-hooks
foo Fatal error: Uncaught TypeError: foo(): Return value must be of type mixed, none returned in /in/I5ipI:6 Stack trace: #0 /in/I5ipI(8): foo('arg') #1 {main} thrown in /in/I5ipI on line 6
Process exited with code 255.

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