File: bug_6323.v

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coq 8.20.1%2Bdfsg-1
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Goal True.
simple refine (let X : Type := _ in _);
    [ abstract exact Set
    | let X' := (eval cbv delta [X] in X) in
      clear X;
      simple refine (let id' : { x : X' | True } -> X' := _ in _);
      [ abstract refine (@proj1_sig _ _) | ]
    ].
  exact I.
Defined.