Add test case

Author: odersky

tests/run/i876.scala

@@ -0,0 +1,10 @@
+object Test extends App {
+  object O
+  implicit def foo(x: O.type): String = "hello"
+  val s: String = O
+  implicit def bar(x: s.type): Int = s.length
+  //implicit def bar2(x: String): Int = s.length
+  val l: Int = s
+  assert(s == "hello")
+  assert(l == 5)
+}