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+From Coq Require Import Cyclic31.
+
+Definition Nat `(int31) := nat.
+Definition Zero (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _: digits) := 0.
+
+Check (eq_refl (int31_rect Nat Zero 1) : 0 = 0).
+Check (eq_refl (int31_rect Nat Zero 1) <: 0 = 0).
+Check (eq_refl (int31_rect Nat Zero 1) <<: 0 = 0).