UFile (package = declaration)
    UClass (name = Utils)
        UMethod (name = foo)
            UBlockExpression
                UReturnExpression
                    ULiteralExpression (value = 42)
        UMethod (name = buzz)
            UParameter (name = $this$buzz)
            UBlockExpression
                UReturnExpression
                    UPolyadicExpression (operator = +)
                        UThisExpression (label = null)
                        ULiteralExpression (value = "... zzz...")
