Fix neg test

Author: odersky

tests/run/toplevel-mixed/B_1.scala

@@ -1,7 +1,7 @@
 
 class x(val s: String)
 
-object y {
+object yy {
   def foo = 3
 }
 

tests/run/toplevel-mixed/Test_2.scala

@@ -4,7 +4,7 @@ object Test extends App {
   assert((new x("abc")).s == "abc")
 
   assert(y("abc") == 3)
-  assert(y.foo == 3)
+  assert(yy.foo == 3)
 
   val x2: X2 = "abc"
   assert(X2.bar == "hi")