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(* Set Printing Existential Instances. *)
Unset Solve Unification Constraints.
Axiom veeryyyyyyyyyyyyloooooooooooooonggidentifier : nat.
Goal True /\ True /\ True \/
veeryyyyyyyyyyyyloooooooooooooonggidentifier =
veeryyyyyyyyyyyyloooooooooooooonggidentifier.
refine (nat_rect _ _ _ _).
Show.
Admitted.
Set Printing Existential Instances.
Goal forall n m : nat, True /\ True /\ True \/
veeryyyyyyyyyyyyloooooooooooooonggidentifier =
veeryyyyyyyyyyyyloooooooooooooonggidentifier.
intros.
refine (nat_rect _ _ _ _).
Show.
clear n.
Show.
3:clear m.
Show.
Admitted.
Unset Printing Existential Instances.
(* Check non regression of error message (the example can eventually
improve though and succeed) *)
Fail Check fun P (x:nat) (h:P x) => exist _ x (h : P x).
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