Definition Cnot (e: Clight.expr) : Clight.expr :=
   Clight.Eunop Cop.Onotbool e type_bool.Fixpoint statement_rect (s : statement) : P s :=
  match s as s0 return (P s0) with
  | Sskip => f
  | Sassign e e0 => f0 e e0
  | Sset i e => f1 i e
  | Scall o e l => f2 o e l
  | Sbuiltin o e t l => f3 o e t l
  | Ssequence s0 s1 => f4 s0 (statement_rect s0) s1 (statement_rect s1)
  | Sifthenelse e s0 s1 => f5 e s0 (statement_rect s0) s1 (statement_rect s1)
  | Sloop s0 s1 => f6 s0 (statement_rect s0) s1 (statement_rect s1)
  | Sbreak => f7
  | Scontinue => f8
  | Sreturn o => f9 o
  | Sswitch e l => f10 e l (labeled_statements_rect l)
  | Slabel l s0 => f11 l s0 (statement_rect s0)
  | Sgoto l => f12 l
  end
  with labeled_statements_rect (l : labeled_statements) : Q l :=
  match l as l0 return (Q l0) with
  | LSnil => f13
  | LScons o s l0 => f14 o s l0 (statement_rect s) (labeled_statements_rect l0)
  end.Local Ltac t := hnf; decide equality; auto.

Lemma eq_dec_external_function : EqDec external_function.