(* This lemma used to be useful since it was mentioned with an unnecessary premise `x>=0` as Z_modulo_2 in ZArith, but the ZArith version has been fixed. *)
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(** Properties of Zdiv                                                       *)
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Lemma Z_div_neg : forall a b : Z, (0 < b)%Z -> (a < 0)%Z -> (a / b < 0)%Z.
Hint Resolve Z_div_mod_eq_2 Z_div_le Z_div_nonneg Z_div_neg: zarith.