don't add a rewrite for symmetry.

Gregory Malecha · Gregory Malecha · commit e04ba4907784 · 2014-08-01T16:30:08.000-04:00
diff --git a/theories/Data/Eq.v b/theories/Data/Eq.v
@@ -17,7 +17,6 @@ Lemma eq_sym_eq
 Proof.
   destruct pf. reflexivity.
 Qed.
-Hint Rewrite eq_sym_eq : eq_rw.
 
 Lemma match_eq_sym_eq
 : forall T (a b : T) (pf : a = b) F X,
