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<?php function x() { yield null; } function y(string $ok) { print $ok; } y(x());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: y(): Argument #1 ($ok) must be of type string, Generator given, called in /in/4S9sX on line 13 and defined in /in/4S9sX:8 Stack trace: #0 /in/4S9sX(13): y(Object(Generator)) #1 {main} thrown in /in/4S9sX on line 8
Process exited with code 255.

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