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<?php $initialGen = function () : iterable { yield 1; yield 2; yield 3; }; var_dump($initialGen); $initialGen = $initialGen(); var_dump($initialGen); function map (callable $f, iterable $xs) : array { return []; } map(function ($x) { return $x * 2; }, $initialGen);
Output for git.master, git.master_jit, rfc.property-hooks
object(Closure)#1 (0) { } object(Generator)#2 (0) { }

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