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(* Exemple soumis par Pierre Corbineau (bug #1671) *)
CoInductive hdlist : unit -> Type :=
| cons : hdlist tt -> hdlist tt.
Variable P : forall bo, hdlist bo -> Prop.
Variable all : forall bo l, P bo l.
Definition F (l:hdlist tt) : P tt l :=
match l in hdlist u return P u l with
| cons (cons l') => all tt _
end.
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