ambig.scala

trait X                       
case class A(i: Int) extends X
case class B(i: Int) extends X

implicit def int2a(i: Int): A = A(i)
implicit def int2b(i: Int): B = B(i)

implicit def int2x(i: Int)(implicit multiplier: Int): X =                          
  if (System.currentTimeMillis % 100 == 0) A(i * multiplier) else B(i * multiplier)

val a: A = 1
val b: B = 2
val x: X = 3

wtf.txt

ambig.scala:13: error: type mismatch;
 found   : Int(3)
 required: this.X
Note that implicit conversions are not applicable because they are ambiguous:
 both method int2x of type (i: Int)(implicit multiplier: Int)this.X
 and method int2b of type (i: Int)this.B
 are possible conversion functions from Int(3) to this.X
val x: X = 3
           ^
one error found