Within a nested closure, "this.method()" works incorrectly if parent closure and outermost class have closures/methods of the same name

class NestedClosureMethodCallBug extends GroovyTestCase {
    def void testNestedClosureMethodCall(){
        assert m() == "method"
        assert c1() == "method"
    }

    def m = {return "method"}
    def c1 = {
        def m = {return "c1"}
        def c2 = {
            /*
            *  If both 'm()' and 'this.m()' are used as follows,
            *  'this.m()' should not resolve to c1 closure's 'm' local variable.
            *  It should resolve to outermost NestedClosureMethodCallBug's 'm()'.
            */
            assert m() == "c1"
            return this.m()
        }
        c2()
    }
}