scalacSwitches.scala

// Adapted from Rob Norris' post at https://tpolecat.github.io/2014/04/11/scalac-flags.html

scalacOptions ++= Seq(
  "-deprecation",           
  "-encoding", "UTF-8",       // yes, this is 2 args
  "-feature",                
  "-unchecked",
  "-Xfatal-warnings",       
  "-Xlint",
  "-Yno-adapted-args",       
  "-Ywarn-dead-code",        // N.B. doesn't work well with the ??? hole
  "-Ywarn-numeric-widen",   
  "-Ywarn-value-discard",
  "-Xfuture"
)

// I want to recommend this but it dramatically slows the compiler
// "-Ywarn-unused-import"     // 2.11 only. 

// I removed the following because I prefer to opt into these on a per file basis.
// I think the compiler's warnings about these are a benefit to novices.
//  "-language:existentials",
//  "-language:higherKinds",
//  "-language:implicitConversions",