Open Scope Z_scope.
(* Pierre L: examples gathered while debugging romega. *)
(* Starting from Coq 8.9 (late 2018), `romega` tactics are deprecated. The tests in this file remain but now call the `lia` tactic. *)
(* Magaud BZ#240 *)
(* Besson BZ#1298 *)
(* Letouzey, May 2017 *)

Lemma test_lia10 : forall x a a' b b',
a' <= b ->
a <= b' ->
b < b' ->
a < a' ->
a <= x < b' <-> a <= x < b \/ a' <= x < b'.