docs: public static <T extends Tree> Matcher<T> inLoop() {
      return new Matcher<T>() {
        @Override
        public boolean matches(Tree tree, VisitorState state) {
          TreePath path = state.getPath().getParentPath();
          Tree node = path.getLeaf();
          while (path != null) {
            switch (node.getKind()) {
              case METHOD:
              case CLASS:
                return false;
              case WHILE_LOOP:
              case FOR_LOOP:
              case ENHANCED_FOR_LOOP:
              case DO_WHILE_LOOP:
                return true;
              default:
                path = path.getParentPath();
                node = path.getLeaf();
                break;
            }
          }
          return false;
        }
      };
    }