(* Former open goals in nested proofs were lost *)
(* This used to fail with "Incorrect number of goals (expected 1 tactic)." *)
Inductive foo := a | b | c.
Goal foo -> foo.
intro x.
simple refine (match x with
| a => _
| b => ltac:(exact b)
| c => _
end); [exact a|exact c].
Abort.
(* This used to leave the goal on the shelf and fails at reflexivity *)
Goal (True/\0=0 -> True) -> True.
intro f.
refine
(f ltac:(split; only 1:exact I)).
reflexivity.
Qed.
(* The "Unshelve" used to not see the explicitly "shelved" goal *)
refine (match b with
Eq => ltac:(shelve)
| Lt => ltac:(give_up)
| Gt => _
end).
exact (eq_refl Gt).
Unshelve.
exact (eq_refl Eq).
Fail auto. (* Check that there are no more regular subgoals *)
Admitted.
(* The "Unshelve" used to not see the explicitly "shelved" goal *)
refine (match b with
Eq => ltac:(shelve)
| Lt => ltac:(give_up)
| Gt => _
end).
Unshelve. (* Note: Unshelve puts goals at the end *)
exact (eq_refl Gt).
exact (eq_refl Eq).
Fail auto. (* Check that there are no more regular subgoals *)
Admitted.
(* The "unshelve" used to not see the explicitly "shelved" goal *)

Lemma f3 (b:comparison) : b=b.