Sample1.scala

private def monotonizeCommitTimestamps[T <: CommitMarker](commits: Array[T]): Array[T] = {
    commits.tail.scanLeft(commits.head)((prev, current) => {
      assert(prev.getVersion < current.getVersion, "Unordered commits provided.")
      if (prev.getTimestamp >= current.getTimestamp) {
        logWarning(s"Found Delta commit ${prev.getVersion} with a timestamp ${prev.getTimestamp} " +
          s"which is greater than the next commit timestamp ${current.getTimestamp}.")
        current.withTimestamp(prev.getTimestamp + 1).asInstanceOf[T]
      }
      else {
        current
      }
    })
  }

this gives an error,

<pastie>:13: error: type mismatch;
 found   : scala.collection.mutable.ArraySeq[T]
 required: Array[T]
    commits.tail.scanLeft(commits.head)((prev, current) => {

is there anyway without changing the return type actual I can return Array[T]?

does changing the signature to private def monotonizeCommitTimestamps[T <: CommitMarker : scala.reflect.ClassTag](commits: Array[T]): Array[T] compile?