File: bug_3637.v

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coq 9.1.0%2Bdfsg-3
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Set Implicit Arguments.
Set Primitive Projections.
Record prod A B := pair { fst : A ; snd : B }.
Goal forall x y : prod Set Set, fst x = fst y.
  intros.
  lazymatch goal with
    | [ |- context[@fst ?A ?B] ] => pose (@fst A B) as fst';
                                   progress change (@fst Set Set) with fst'
end.
Abort.