Useful Scalac Flags
So, there have been some discussions and angry tweets recently about irritating Scala "features" (like value discarding and auto-tupling) that can actually be turned off by selecting the right compiler flag in conjunction with
-Xfatal-warnings. I highly recommend a set of options something like those below.
scalacOptions ++= Seq( "-deprecation", "-encoding", "UTF-8", // yes, this is 2 args "-feature", "-language:existentials",