anchor.diff:  health_fsm(waiting, remove, _Service, InCheck) ->
       case InCheck#health_check.interval_tref of
           undefined -> ok;
  -        Tref -> erlang:cancel_timer(Tref),
  -                ok
  +        Tref ->
  +            _ = erlang:cancel_timer(Tref),
  +            ok
       end,
       OutCheck = InCheck#health_check{interval_tref = undefined},
       {remove, waiting, OutCheck};
  
positive.code:         undefined ->
              ok;
          OldTref ->
              erlang:cancel_timer(OldTref),
              ok
      end,
      Interval = app_helper:get_env(riak_core, gossip_interval),
  
negative.code:     Pid = CheckRec#health_check.service_pid,
      case CheckRec#health_check.interval_tref of
          undefined -> ok;
          Tref ->
              _ = erlang:cancel_timer(Tref),
              ok
      end,
      CheckingPid = proc_lib:spawn_link(fun() ->
          case erlang:apply(Mod, Func, [Pid | Args]) of
  