Allow binding of a complex expression using multiple facts

    @Test
    public void testVariableInsideBinding() {
        String str =
                "import " + Person.class.getCanonicalName() + ";" +
                        "import " + NameLengthCount.class.getCanonicalName() + ";" +
                        "rule X when\n" +
                        "  $nlc : NameLengthCount() \n" +
                        "  Person ( $nameLength : $nlc.getNameLength(name))" +
                        "then\n" +
                        "end";

        Results results = createKieBuilder(str ).getResults();
        assertThat(results.getMessages(Message.Level.ERROR).stream().map(Message::getText))
                .contains("Variables can not be used inside bindings. Variable [$nlc] is being used in binding '$nlc.getNameLength(name)'");
    }

    public static class NameLengthCount {
        public int getNameLength(String name) {
            return name.length();
        }
    }