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(* Test surgical use of beta-iota in the type of variables coming from
pattern-matching for refine *)
Goal forall x : sigT (fun x => x = 1), True.
intro x; refine match x with
| existT _ x' e' => _
end.
lazymatch goal with
| [ H : _ = _ |- _ ] => idtac
end.
Abort.
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