anchor.diff:        end;
       module ->
         case proplists:is_defined(module, Rest) of
  -        true -> opt_error("Multiple instances of '--module'.");
  +        true -> opt_error("Multiple instances of '--module'");
           false -> ok
         end,
         case proplists:get_value(test, Rest, 1) of
           Name when is_atom(Name) ->
             NewRest = proplists:delete(test, Rest),
             finalize(NewRest, [{entry_point, {Value, Name, []}}|Acc]);
  -        _ -> opt_error("The name of the test function is missing")
  +        _ -> opt_error("The name of the test function is missing.")
         end;
       output ->
         case file:open(Value, [write]) of
  
positive.code: -spec file_error(atom(), term()) -> no_return().
  
  file_error(Key, Value) ->
    opt_error("could not open '--~w' file ~s for writing", [Key, Value]).
  
  compile_and_load(Files, Options) ->
    Modules = proplists:get_value(modules, Options),
  
negative.code:           finalize(Rest, [Option|Acc]);
          _Else ->
            opt_error(
              "'--~s' value must be -1 (infinity) or >= ~w.",
              [Key, ?MINIMUM_TIMEOUT])
        end;
      test ->
  