anchor.diff:              IndexedLate ={Index, Event#event{location = []}},
               concuerror_logger:race(Logger, IndexedEarly, IndexedLate);
              true ->
  -            ?unique(
  -               Logger, ?linfo,
  -               "You can see pairs of racing instructions (in the report and"
  -               " --graph) with '--show_races true'~n",
  -               [])
  +            ?unique(Logger, ?linfo, msg(show_races), [])
           end,
           {Rest, NC, S}
       end,
  
positive.code: -spec explain_error(term()) -> string().
  
  explain_error(first_interleaving_crashed) ->
    {
      io_lib:format(
        "The first interleaving of your test had errors. Check the output file."
        " You may then use -i to tell Concuerror to continue or use other options"
        " to filter out the reported errors, if you consider them acceptable"
        " behaviours.",
        []),
      warning};
  explain_error({replay_mismatch, I, Event, NewEvent, Depth}) ->
    [EString, NEString] =
      [concuerror_printer:pretty_s(E, Depth) || E <- [Event, NewEvent]],
  
negative.code: 
  %%==============================================================================
  
  msg(first_interleaving_crashed) ->
    "The first interleaving of your test had errors. Check the output file."
      " You may then use -i to tell Concuerror to continue or use other options"
      " to filter out the reported errors, if you consider them acceptable"
      " behaviours.";
  msg(signal) ->
    "An abnormal exit signal was sent to a process. This is probably the worst"
      " thing that can happen race-wise, as any other side-effecting"
      " operation races with the arrival of the signal. If the test produces"
      " too many interleavings consider refactoring your code.~n";
  msg(show_races) ->
    "You can see pairs of racing instructions (in the report and"
      " --graph) with '--show_races true'~n";
  msg(shutdown) ->
    "A process crashed with reason 'shutdown'. This may happen when a"
      " supervisor is terminating its children. You can use '--treat_as_normal"
  