UFile (package = )
    UClass (name = Foo)
        UMethod (name = Foo)
        UClass (name = Bar)
            UField (name = a)
            UField (name = b)
            UMethod (name = Bar)
                UParameter (name = a)
                UParameter (name = b)
            UMethod (name = getA)
            UMethod (name = getB)
            UMethod (name = getAPlusB)
                UBlockExpression
                    UReturnExpression
                        [!] UnknownKotlinExpression (BINARY_EXPRESSION)
            UClass (name = Baz)
                UMethod (name = Baz)
                UMethod (name = doNothing)
                    UBlockExpression
                        UReturnExpression
                            USimpleNameReferenceExpression (identifier = Unit)
