How to Chain Implicit Conversions (aka Views) in Scala

chained-implicits.scala

class T {
  val t = "T"
}

class U
class V
 
object T {
  implicit def UToT[UU <% U](u: UU) = new T
}
 
object U {
  implicit def VToU[VV <% V](v: VV) = new U
}
 
object V {
  implicit def StringToV(s: String) = new V
}
 
object Test {
  import T._
  import U._
  import V._
 
  "": T
  
  // compiles to:
  // (T.UToT[java.lang.String]("")({
  // ((v: java.lang.String) => U.VToU[java.lang.String](v)({
  // ((s: String) => V.StringToV(s))
  // }))
  // }): T)

  "".t // this also triggers the conversion.
}