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+(* Test that adding notations that overlap with the tactic grammar does not
+* interfere with Ltac parsing. *)
+
+Module test1.
+  Notation "x [ y ]" := (fst (id x, id y)) (at level 11).
+
+  Goal True \/ (exists x : nat, True /\ True) -> True.
+  Proof.
+  intros [|[a [y z]]]; [idtac|idtac]; try solve [eauto | trivial; [trivial]].
+  Qed.
+End test1.
+
+Module test2.
+  Notation "x [ y ]" := (fst (id x, id y)) (at level 100).
+  Goal True \/ (exists x : nat, True /\ True) -> True.
+  Proof.
+  intros [|[a [y z]]]; [idtac|idtac]; try solve [eauto | trivial; [trivial]].
+  Qed.
+End test2.
+
+Module test3.
+  Notation "x [ y ]" := (fst (id x, id y)) (at level 1).
+  Goal True \/ (exists x : nat, True /\ True) -> True.
+  Proof.
+  intros [|[a [y z]]]; [idtac|idtac]; try solve [eauto | trivial; [trivial]].
+  Qed.
+End test3.
+
+Module test1'.
+  Notation "x [ [ y ] ] " := (fst (id x, id y)) (at level 11).
+
+  Goal True \/ (exists x : nat, True /\ True) -> True.
+  Proof.
+  intros [|[a [y z]]]; [idtac|idtac]; try solve [eauto | trivial; [trivial]].
+  Qed.
+End test1'.
+
+Module test2'.
+  Notation "x [ [ y ] ]" := (fst (id x, id y)) (at level 100).
+  Goal True \/ (exists x : nat, True /\ True) -> True.
+  Proof.
+  intros [|[a [y z]]]; [idtac|idtac]; try solve [eauto | trivial; [trivial]].
+  Qed.
+End test2'.
+
+Module test3'.
+  Notation "x [ [ y ] ]" := (fst (id x, id y)) (at level 1).
+  Goal True \/ (exists x : nat, True /\ True) -> True.
+  Proof.
+  intros [|[a [y z]]]; [idtac|idtac]; try solve [eauto | trivial; [trivial]].
+  Qed.
+End test3'.