Make it possible to use an enum in an expression (i.e. selecting one of the enum values: Foo.A)

src/test/java/FunctionDefinitionTest.java

@@ -10,7 +10,7 @@ public class FunctionDefinitionTest {
     @Test
     void shouldNotThrowIfReturnTypeIsReferringToAnEnum() {
         // given
-        var tree = Helper.prepareParser(" enum bar {A,B,C} function foo(a: int): bar { return bar.A; } foo();");
+        var tree = Helper.prepareParser(" enum bar {A,B,C} function foo(a: int): bar { return bar.A; } foo(1);");
         var ctxAnal = new ContextAnalysis(
                 Helper.getFuncs(tree),
                 Helper.getStructs(tree),