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<?php function &gen(array $array) { yield from $array; } $array = [1, 2, 3]; foreach (gen($array) as &$v) { $v += 1; } var_dump($array);
Output for git.master_jit, git.master
Fatal error: Cannot use "yield from" inside a by-reference generator in /in/fZEH0 on line 4 Stack trace: #0 {main}
Process exited with code 255.

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