php interface declaration duplication.

gistfile1.aw

<?php

interface Foo {
    function test();
}

interface Bar {
    function test();
}

interface Baz {
    function test($arg);
}

class Hoge implements Foo, Bar {
        function test() {
                // valid!
        }
}

class Fuga implements Foo, Bar, Baz {
        function test() {
                // invalid!
        }
}