Removing warts from Scala by making them ambiguous

AmbiguousStringAdd.scala

import language.implicitConversions

class AmbiguousStringAdd {
  def +(b: String) = ???
}

implicit def amb1anyref2stringadd(a: AnyRef) = new AmbiguousStringAdd
implicit def amb2anyref2stringadd(a: AnyRef) = new AmbiguousStringAdd

class A {}

// Won't compile!
// println(new A + "ASDF")

// Sadly, this still works when implicit on Any, due to compiler magic
println(1 + "ASDF")