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Set Primitive Projections.
Set Implicit Arguments.
Record prod A B := pair { fst : A ; snd : B }.
Goal forall A B : Set, True.
Proof.
intros A B.
evar (a : prod A B); evar (f : (prod A B -> Set)).
let a' := (eval unfold a in a) in
set(foo:=eq_refl : a' = (@pair _ _ (fst a') (snd a'))).
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