Github user rcsenkbeil commented on the pull request: https://github.com/apache/spark/pull/1929#issuecomment-52309557 @mateiz @som-snytt The summary I have is that this should work for 2.10.x as it doesn't appear like they are trickling the removal of the class invalidation from [scala/scala#3884](https://github.com/scala/scala/pull/3884). I've given more analysis to the internal classpath editing from 2.10 and I don't see any potential side effects from appending to the existing merged classpath. In terms of Spark moving to 2.11(.3 or higher) in the future, one option would be to simply include a trait mixed in with global that keeps the functionality they removed. From what I've seen, the only reason they removed it was because it wasn't used in the compiler or sbt, not that it had any issues. The underlying functionality wasn't broken, so I don't see any harm in doing that as a backup.
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