UFile (package = )
    UClass (name = ElvisKt)
        UMethod (name = foo)
            UParameter (name = bar)
            UBlockExpression
                UReturnExpression
                    ULiteralExpression (value = null)
        UMethod (name = bar)
            UBlockExpression
                UReturnExpression
                    ULiteralExpression (value = 42)
        UMethod (name = baz)
            UBlockExpression
                UReturnExpression
                    [!] UnknownKotlinExpression (BINARY_EXPRESSION)
