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<?php $a = function(&$arg) { echo "ok"; }; $z = 1; class MyContext {} $a->call(new MyContext, $z);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: MyContext::{closure}(): Argument #1 ($arg) must be passed by reference, value given in /in/SPse9 on line 6 ok

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