Warning at target/scala-2.13/src_managed/main/sbt-scalaxb/scalaxb/scalaxb.scala:692:81 match may not be exhaustive

```
target/scala-2.13/src_managed/main/sbt-scalaxb/scalaxb/scalaxb.scala:692:81
match may not be exhaustive.
It would fail on the following inputs: Error(_, _), Failure(_, _)
    private def lookupSuccess[U](p: Parser[U], input: Input): ParseResult[U] = p(input) match {
```