Restored full test

Uncommented parts that were left accidentally commented out when debugging.

Author: odersky

tests/run/unittest_collection.scala

@@ -4,11 +4,11 @@ object Test {
 
   def main(args: Array[String]): Unit = {
     test(collection.mutable.ArrayBuffer[String]())
-//    test(collection.mutable.ListBuffer[String]())
-//    class BBuf(z:ListBuffer[String]) extends BufferProxy[String] {
-//      def self = z
-//    }
-//    test(new BBuf(collection.mutable.ListBuffer[String]()))
+    test(collection.mutable.ListBuffer[String]())
+    class BBuf(z:ListBuffer[String]) extends BufferProxy[String] {
+      def self = z
+    }
+    test(new BBuf(collection.mutable.ListBuffer[String]()))
   }
 
   def test(x: Buffer[String]): Unit = {