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<?php function test() { $n = 1; while (true) { $arg = yield $arg; echo $arg; echo $n; $n++; } } $test = test(); $test->send('A'); $test->send('B');
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $arg in /in/6vCjv on line 7 A1B2

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