Hint Rewrite sem_cast_neutral_int using
  (auto;
   match goal with H: is_int ?i ?s ?v |- isVint ?v => apply (is_int_is_Vint i s v H) end) : norm.

Lemma deref_noload_Tarray: forall ty n a, deref_noload (Tarray ty n a) = (fun v => v).