(** ROmega is now aware of the bodies of context variables (of type Z or nat). See also #148 for the corresponding improvement in Omega. *)
Open Scope Z.
Goal let x := 3 in x = 3.
intros.
lia.
Qed.
(** Example seen in #4132 (actually solvable even if b isn't known to be 5) *)

Lemma foo
(x y x' zxy zxy' z : Z)
(b := 5)
(Ry : - b <= y < b)
(Bx : x' <= b)
(H : - zxy' <= zxy)
(H' : zxy' <= x') : - b <= zxy.