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+From Ltac2 Require Import Ltac2.
+From Coq Require Import ZArith String List.
+
+Open Scope Z_scope.
+
+Check 1 + 1 : Z.
+
+Ltac2 Notation "ex" arg(constr(nat,Z)) := arg.
+
+Check (1 + 1)%nat%Z = 1%nat.
+
+Lemma two : nat.
+  refine (ex (1 + 1)).
+Qed.
+
+Import ListNotations.
+Close Scope list_scope.
+
+Ltac2 Notation "sl" arg(constr(string,list)) := arg.
+
+Lemma maybe : list bool.
+Proof.
+  refine (sl ["left" =? "right"]).
+Qed.