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Goal forall (n : nat) (H := eq_refl : n = n) (H' : n = 0), H = eq_refl.
intros.
subst. (* Toplevel input, characters 15-20:
Error: Abstracting over the term "n" leads to a term
"λ n : nat, H = eq_refl" which is ill-typed. *)
Undo.
revert H.
subst. (* success *)
Undo.
intro.
clearbody H.
subst. (* success *)
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