[@DavidPerezIngeniero]: http://github.com/DavidPerezIngeniero
  [2008]: https://github.com/sbt/sbt/issues/2008
  [2009]: https://github.com/sbt/sbt/pull/2009

### Fixes with compatibility implications

### Improvements

- Adds more diagnostic info for underfined settings.
  [#2008][2008]/[#2009][2009] by [@DavidPerezIngeniero][@DavidPerezIngeniero]

### Bug fixes