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<?php $closure = function($a, $b) {}; echo (string) new ReflectionFunction($closure);
Output for git.master_jit, git.master
Closure [ <user> function {closure:/in/5eYonp:3} ] { @@ /in/5eYonp 3 - 3 - Parameters [2] { Parameter #0 [ <required> $a ] Parameter #1 [ <required> $b ] } }

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