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<?php function foo() { $a = func_get_args(); call_user_func('bar', $a[0]); } function bar(&$x) { echo $x; } foo(42);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: bar(): Argument #1 ($x) must be passed by reference, value given in /in/6RVcB on line 3 42

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