Definition memval_lessdef: memval -> memval -> Prop := memval_inject inject_id.

Lemma bytes_of_int_append: forall n2 x2 n1 x1, 0 <= x1 < two_p (Z.of_nat n1 * 8) -> bytes_of_int (n1 + n2) (x1 + x2 * two_p (Z.of_nat n1 * 8)) = bytes_of_int n1 x1 ++ bytes_of_int n2 x2.