--TEST--
Invalid conflict resolution (unused trait as lhs of "as")
--FILE--
<?php
trait T1 {
    function foo() {echo "T1\n";}
}
trait T2 {
        function foo() {echo "T2\n";}
}
class C {
    use T1 {
        T2::foo as private;
    }
}
?>
--EXPECTF--
Fatal error: Required Trait T2 wasn't added to C in %slanguage017.php on line %d