Test case closes SI-4273.

Author: paulp

test/files/pos/t4273.scala

@@ -0,0 +1,8 @@
+class A {
+  implicit def compareComparables[T](x: T)(implicit ord: Ordering[T]) = new ord.Ops(x)
+  
+  class Bippy
+  implicit val bippyOrdering = new Ordering[Bippy] { def compare(x: Bippy, y: Bippy) = util.Random.nextInt }
+  
+  (new Bippy) < (new Bippy)
+}