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diff --git a/test-suite/arithmetic/compare.v b/test-suite/arithmetic/compare.v
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+Require Import Int63.
+
+Set Implicit Arguments.
+
+Open Scope int63_scope.
+
+Check (eq_refl : 1 ?= 1 = Eq).
+Check (eq_refl Eq <: 1 ?= 1 = Eq).
+Check (eq_refl Eq <<: 1 ?= 1 = Eq).
+Definition compute1 := Eval compute in 1 ?= 1.
+Check (eq_refl compute1 : Eq = Eq).
+
+Check (eq_refl : 1 ?= 2 = Lt).
+Check (eq_refl Lt <: 1 ?= 2 = Lt).
+Check (eq_refl Lt <<: 1 ?= 2 = Lt).
+Definition compute2 := Eval compute in 1 ?= 2.
+Check (eq_refl compute2 : Lt = Lt).
+
+Check (eq_refl : 9223372036854775807 ?= 0 = Gt).
+Check (eq_refl Gt <: 9223372036854775807 ?= 0 = Gt).
+Check (eq_refl Gt <<: 9223372036854775807 ?= 0 = Gt).
+Definition compute3 := Eval compute in 9223372036854775807 ?= 0.
+Check (eq_refl compute3 : Gt = Gt).