public sealed override BoundNode VisitOutVariablePendingInference(
     OutVariablePendingInference node
     )
 {
     throw ExceptionUtilities.Unreachable;
 }
 public override sealed BoundNode VisitOutVariablePendingInference(OutVariablePendingInference node)
 {
     throw ExceptionUtilities.Unreachable;
 }