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(** Occur-check for Meta (up to application of already known instances) *)
Goal forall (f: nat -> nat -> Prop) (x:bool)
(H: forall (u: nat), f u u -> True)
(H0: forall x0, f (if x then x0 else x0) x0),
False.
intros.
Fail apply H in H0. (* should fail without exhausting the stack *)
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