Module CC := Clight.Module CC' := Clight_core.Definition CCstep s1 s2 := 
  Clight_core.at_external s1 = None /\
  Clight.step ge (Clight.function_entry2 ge) s1 Events.E0 s2.Fixpoint strip_skip' (k: CC.cont) : CC.cont :=
 match k with
 | CC.Kseq Sskip k' => strip_skip' k'
 | _ => k
 end.Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive match_cont:  cont -> CC.cont -> Prop :=
  | match_cont_nil: match_cont nil CC.Kstop
  | match_cont_seq: forall s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq s :: k) (CC.Kseq s k')
  | match_cont_loop1: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq Scontinue :: Kloop1 s e3 :: k) (CC.Kloop1 s e3 k')
  | match_cont_loop2: forall e3 s k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kloop2 s e3 :: k) (CC.Kloop2 s e3 k')
  | match_cont_switch: forall k k',
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kswitch :: k) (CC.Kswitch k')
  | match_cont_call: forall lid fd f ve te k k'
         (CUR: match current_function k with Some f' => f'=f | _ => True end),
         match_cont (strip_skip k) (strip_skip' k') ->
          match_cont (Kseq (Sreturn None) :: Kcall lid fd ve te :: k) (CC.Kcall lid f ve te k').Inductive star: state -> state -> Prop :=
  | star_refl: forall s,
      star s s
  | star_step: forall s1 s2 s3,
      CCstep s1 s2 -> star s2 s3 -> star s1 s3.Inductive star: state -> state -> Prop :=
  | star_refl: forall s,
      star s s
  | star_step: forall s1 s2 s3,
      CCstep s1 s2 -> star s2 s3 -> star s1 s3.Inductive star: state -> state -> Prop :=
  | star_refl: forall s,
      star s s
  | star_step: forall s1 s2 s3,
      CCstep s1 s2 -> star s2 s3 -> star s1 s3.

Lemma star_two: forall s1 s2 s3, CCstep s1 s2 -> CCstep s2 s3 -> star s1 s3.