File: bug_5163.v

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Lemma TrueI : unit -> True.
Proof. easy. Qed.

Create HintDb db.

Ltac diverge a := diverge a.
#[local] Hint Extern 99 => diverge idtac : db.
#[local] Hint Extern 0 (True) => apply TrueI : db.
#[local] Hint Extern 0 (unit) => exact tt : db.

Goal True.
Proof.
  Succeed (solve [unshelve auto with db nocore]).
  Succeed (solve [unshelve typeclasses eauto with db nocore]).
  Succeed (solve [timeout 1 unshelve eauto with db nocore]).
Abort.