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<?php function test() { yield from $a; } foreach (test() as $val) { echo $val; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $a in /in/9ri2a on line 5 Fatal error: Uncaught Error: Can use "yield from" only with arrays and Traversables in /in/9ri2a:5 Stack trace: #0 /in/9ri2a(8): test() #1 {main} thrown in /in/9ri2a on line 5
Process exited with code 255.

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