Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.Record fsim_properties_inj: Type :=
      {  Injindex: Type;
        Injorder: Injindex -> Injindex -> Prop;
        Injmatch_states: Injindex -> meminj -> state L1 -> state L2 -> Prop;  
        Injfsim_order_wf: well_founded Injorder;
        Injfsim_match_meminj: forall i f s1 s2, Injmatch_states i f s1 s2 ->  Mem.inject f (get_mem1 s1) (get_mem2 s2);
        Injfsim_match_full: forall i f s1 s2,
            Injmatch_states i f s1 s2 ->
            injection_full f (get_mem1 s1);
        Injfsim_match_start_stacks:
          forall s1 f arg m0, start_stack L1 m0 s1 f arg  ->
                         exists i j s2, start_stack L2 m0 s2 f arg /\ Injmatch_states i j s1 s2;
        Injfsim_match_initial_states:
          forall s1, initial_state L1 s1 -> 
                exists i f s2, initial_state L2 s2 /\ Injmatch_states i f s1 s2;
        Injfsim_match_final_states:
          forall i s1 s2 r f,
            Injmatch_states i f s1 s2 -> final_state L1 s1 r -> (final_state L2 s2 r);
        Injfsim_simulation:
          forall s1 t s1' f, Step L1 s1 t s1' ->
                        forall i s2, Injmatch_states i f s1 s2 ->
                                exists i', exists s2' f' t',
                                    (Plus L2 s2 t' s2' \/ (Star L2 s2 t' s2' /\ Injorder i' i))
                                    /\ Injmatch_states i' f' s1' s2' /\
                                    Values.inject_incr f f' /\
                                    inject_trace f' t t';
        Injfsim_public_preserved:
          forall id, Senv.public_symbol (symbolenv L2) id = Senv.public_symbol (symbolenv L1) id
      }.

Lemma inject_trace_compose: forall f12 f23 t1 t2 t3, inject_trace f12 t1 t2 -> inject_trace f23 t2 t3 -> inject_trace (compose_meminj f12 f23) t1 t3.