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<?php declare(strict_types=1); /** * @param Foo|callable $x * @return string */ function process(callable $x): string { return $x(); } class Foo { public function __invoke(): string { return 'I know kung fu!'; } } echo process(new Foo()); echo process(function(): int { return 42; });
Output for git.master, git.master_jit, rfc.property-hooks
I know kung fu! Fatal error: Uncaught TypeError: process(): Return value must be of type string, int returned in /in/4Ncgj:11 Stack trace: #0 /in/4Ncgj(23): process(Object(Closure)) #1 {main} thrown in /in/4Ncgj on line 11
Process exited with code 255.

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