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Require Import Int63 ZArith.
Open Scope int63_scope.
Goal False.
cut (let (q, r) := (0, 0) in ([|q|], [|r|]) = (9223372036854775808%Z, 0%Z));
[discriminate| ].
Fail (change (0, 0) with (diveucl_21 1 0 1); apply diveucl_21_spec).
Abort.
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