t112706A.scala:5: error: constructor cannot be instantiated to expected type;
 found   : (T1, T2)
 required: String
    case Tuple2(node,_) =>   
         ^
t112706A.scala:5: error: Could not typecheck extractor call: case class Tuple2 with arguments List((node @ _), _)
    case Tuple2(node,_) =>   
               ^
two errors found