fix

Author: kim-em

Mathlib/Topology/Instances/Rat.lean

@@ -82,7 +82,8 @@ theorem uniformContinuous_add : UniformContinuous fun p : ℚ × ℚ => p.1 + p.
 
 theorem uniformContinuous_neg : UniformContinuous (@Neg.neg ℚ _) :=
   Metric.uniformContinuous_iff.2 fun ε ε0 =>
-    ⟨_, ε0, fun _ _ h => by simpa only [abs_sub_comm, dist_eq, cast_neg, neg_sub_neg] using h⟩
+    ⟨_, ε0, fun _ _ h => by
+      simpa only [_root_.abs_sub_comm, dist_eq, cast_neg, neg_sub_neg] using h⟩
 
 instance : IsUniformAddGroup ℚ :=
   IsUniformAddGroup.mk' Rat.uniformContinuous_add Rat.uniformContinuous_neg