File: bug_4328.v

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coq 8.20.1%2Bdfsg-1
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Inductive M (A:Type) : Type := M'.
Axiom pi : forall (P : Prop) (p : P), Prop.
Definition test1 A (x : _) := pi A x.           (* success     *)
Definition test2 A (x : A) := pi A x.           (* success *)
Fail Definition test3 A (x : A) (_ : M A) := pi A x. (* failure     *)
Fail Definition test4 A (_ : M A) (x : A) := pi A x. (* success ??? *)