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(* Some boilerplate *)
Fixpoint fib n := match n with
| O => 1
| S m => match m with
| O => 1
| S o => fib o + fib m end end.
Ltac sleep n :=
try (cut (fib n = S (fib n)); reflexivity).
(* Tune that depending on your PC *)
Let time := 18.
(* Beginning of demo *)
Section Demo.
Variable i : True.
Lemma a : True.
Proof using i.
sleep time.
idtac.
sleep time.
(* Error, jump back to fix it, then Qed again *)
exact (i i).
Qed.
Lemma b : True.
Proof using i.
sleep time.
idtac.
sleep time.
(* Here we use "a" *)
exact a.
Qed.
Lemma work_here : True /\ True.
Proof using i.
(* Jump directly here, Coq reacts immediately *)
split.
exact b. (* We can use the lemmas above *)
exact a.
Qed.
End Demo.
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