docs: public AstNode getChildforNameAndType( AstNode astNode,
                                             String name,
                                             String nodeType ) {
          CheckArg.isNotNull(astNode, "astNode");
          CheckArg.isNotNull(name, "name");
          CheckArg.isNotNull(nodeType, "nodeType");
  
          for (AstNode child : astNode.getChildren()) {
              if (hasMixinType(child, nodeType)) {
                  if (name.equalsIgnoreCase(child.getName())) {
                      return child;
                  }
              }
          }
          return null;
      }