public override bool Walk(ReturnNode node) {
     if (node.Operand != null) {
         ReplaceFollowingWhiteSpace(node.GetStartIndex(_tree.LocationResolver) + "return".Length, " ");
         node.Operand.Walk(this);
     }
     RemoveSemiColonWhiteSpace(node.GetEndIndex(_tree.LocationResolver));
     return false;
 }