missed another warning

theories/algebra/irelations.v

@@ -14,6 +14,7 @@
 From Coq Require Import Wf_nat Omega.
 From stdpp Require Export tactics base relations list collections.
 From stdpp Require set.
+Require ClassicalEpsilon.
 
 (** * Definitions *)
 Section definitions.
@@ -1000,7 +1001,7 @@ Section cofair.
   Qed.
   
   Section erasure.
-  Require Import ClassicalEpsilon.
+  Import ClassicalEpsilon.
   Context (erasure: A → B).
   Context (enabled_reflecting: ∀ i a, enabled R2 (erasure a) i → enabled R1 a i).
   Context (estep_dec: ∀ `(HR: R1 i a b),  {R2 i (erasure a) (erasure b)} + 
@@ -1337,7 +1338,7 @@ Section cofair.
   End erasure.
 
   Section block.
-    Import stdpp.set.
+    Import stdpp.set ClassicalEpsilon.
     Context (flatten: A → B * (nat → set nat)).
     Context (flatten_spec_step:
                ∀ i a a',  R1 i a a' →