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<?php function foo(callable $arg) : callable { return $arg; } function bar() : callable { return 'hello'; } bar('hello')(); foo('hello')();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: bar(): Return value must be of type callable, string returned in /in/KTasL:8 Stack trace: #0 /in/KTasL(11): bar('hello') #1 {main} thrown in /in/KTasL on line 8
Process exited with code 255.

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