Notation "s #2" := (snd s) (at level 9, format "s '#2'") : pair_scope.Definition world_sem : semantics := @Semantics_gen
  (state L * world)%type
  (genvtype L)
  (fun ge s t s' => step L ge s#1 t s'#1 /\ possible_trace s#2 t s'#2)
  (fun s => initial_state L s#1 /\ s#2 = initial_world)
  (fun s r => final_state L s#1 r)
  (globalenv L)
  (symbolenv L).

Theorem world_sem_deterministic: sem_deterministic world_sem.