gistfile1.scala

// Type class
trait Burp[A] {
  def burp(in: A): String
}

object Burp {
  def apply[A](implicit burp: Burp[A]): Burp[A] = burp
}

case class Foo(name: String)

object Foo {
  // Type class instances

  // Uncomment valOne and valTwo = ambiguity error
  // Uncomment objectOne and objectTwo = ambiguity error
  // Uncomment one val and one object = no ambiguity error
  //
  // Using Scala 2.10
  implicit val valOne = new Burp[Foo] {
    def burp(in: Foo): String = "valOne"
  }

  // //implicit val valTwo = new Burp[Foo] {
  //   def burp(in: Foo): String = "valTwo"
  // }

  implicit object objectOne extends Burp[Foo] {
    def burp(in: Foo): String = "objectOne"
  }

  //implicit object objectTwo extends Burp[Foo] {
  //  def burp(in: Foo): String = "objectTwo"
  //}
}

object Example {
  def example = {
    Burp[Foo].burp(Foo("hi"))
  }
}