AmbiguousStringAdd.scala

import language.implicitConversions

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

implicit def amb1any2stringadd(a: Any) = new AmbiguousStringAdd
implicit def amb2any2stringadd(a: Any) = new AmbiguousStringAdd

class A {}

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

// Sadly, scala.Int and scala.Double have +(x: String) defined
println(1 + "ASDF") 
println(2.3 + "ASDF")