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<?php $b = 10; $f = function() use ($b) { return $x = function($b) { return $b; }; }; var_dump( $f(1));
Output for git.master, git.master_jit, rfc.property-hooks
object(Closure)#2 (1) { ["parameter"]=> array(1) { ["$b"]=> string(10) "<required>" } }

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