: A -> B), map f nil = nil.
Proof. reflexivity. Qed.

Hint Rewrite @map_nil : norm.
Hint Rewrite @map_nil : subst.

Fixpoint remove_localdef_temp (i: ident) (l: list localdef) : list localdef :=
  match l with
  | nil => nil
  | d :: l0 =>
     match d with
     | temp j v =>
       if ident_eq i j

| _ => d :: remove_localdef_temp i l0 end