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Require Import ZArith ZifyInt63 Lia.
Require Import Int63.
Open Scope int63_scope.
Goal forall (x:int), 0 <= x = true.
Proof. lia. Qed.
Goal max_int = 9223372036854775807.
Proof. lia. Qed.
Goal digits = 63.
Proof. lia. Qed.
Goal wB = (2^63)%Z.
Proof. lia. Qed.
Goal forall x y, x + y <= max_int = true.
Proof. lia. Qed.
Goal forall x, x <> 0 -> x / x = 1.
Proof.
nia.
Qed.
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