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<?php declare(strict_types = 1); interface Foo { /** * @return string|object The violation message as a string or a stringable object */ function getMessage(); } class SomeMessage implements Foo { /** * {@inheritDoc} */ public function getMessage() { return new class { public function __toString(): string { return 'Hello World'; } }; } }; (static function (string $message): void { echo $message; })((new SomeMessage())->getMessage());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($message) must be of type string, class@anonymous given, called in /in/hTYEZ on line 26 and defined in /in/hTYEZ:24 Stack trace: #0 /in/hTYEZ(26): {closure}(Object(class@anonymous)) #1 {main} thrown in /in/hTYEZ on line 24
Process exited with code 255.

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