Fix observation for timedout/1

When considering the output of a timedout/1 observation, do not carry
about the order, but only that we return the right amount of elements.
Thus by sorting the output we make sure that we get the right kind of
observation.

test/jobs_eqc_queue.erl

@@ -83,7 +83,7 @@ timedout_obs(Mod, #model { st = Q} = M) ->
     set_time(M),
     case Mod:timedout(Q) of
         [] -> [];
-        {TO, _} -> TO
+        {TO, _} -> lists:sort(TO)
     end.
 
 in(Mod, Job, #model { time = T, st = Q} = M) ->
@@ -162,23 +162,22 @@ prop_queue() ->
               catching(fun() ->
                                R = eval(M),
                                Ty:representation(R#model.st)
-                       end, e),
+                       end),
               catching(fun () ->
                                R = model(M),
                                jobs_queue_model:representation(R#model.st)
-                       end, q)))).
+                       end)))).
 
 prop_observe() ->
     ?FORALL(Obs, obs(),
             equals(
-              catching(fun() -> eval(Obs) end, e),
-              catching(fun() -> model(Obs) end, m))).
+              catch eval(Obs),
+              catch model(Obs))).
 
-catching(F, T) ->
+catching(F) ->
         try F()
         catch C:E ->
-                io:format("Exception: ~p:~p~n", [C, E]),
-                T
+                {exception, C, E}
         end.
 
 set_time(#model { time = T}) ->