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<?php declare(strict_types = 1); class HelloWorld { public static function sayHello(string $s): string { $a = [$s => $s]; return array_keys($a)[0]; } } HelloWorld::sayHello('1');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: HelloWorld::sayHello(): Return value must be of type string, int returned in /in/pDkoB:9 Stack trace: #0 /in/pDkoB(13): HelloWorld::sayHello('1') #1 {main} thrown in /in/pDkoB on line 9
Process exited with code 255.

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