UFile (package = )
    UClass (name = Strings)
        UMethod (name = foo)
            UBlockExpression
                UDeclarationsExpression
                    ULocalVariable (name = s1)
                        ULiteralExpression (value = "Hello ")
                UDeclarationsExpression
                    ULocalVariable (name = s2)
                        UBinaryExpression (operator = +)
                            USimpleNameReferenceExpression (identifier = s1)
                            ULiteralExpression (value = "wounderful")
                UDeclarationsExpression
                    ULocalVariable (name = s3)
                        ULiteralExpression (value = " world ")
                UDeclarationsExpression
                    ULocalVariable (name = s4)
                        UBinaryExpression (operator = +)
                            USimpleNameReferenceExpression (identifier = s2)
                            USimpleNameReferenceExpression (identifier = s3)
                UDeclarationsExpression
                    ULocalVariable (name = s5)
                        UBinaryExpression (operator = +)
                            USimpleNameReferenceExpression (identifier = s4)
                            ULiteralExpression (value = 2016)
                UDeclarationsExpression
                    ULocalVariable (name = empty)
                        ULiteralExpression (value = "")
                UReturnExpression
                    USimpleNameReferenceExpression (identifier = s5)
