diff --git a/ChangeLog b/ChangeLog
index 0674c3d16e..d57ad36655 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Thu Jan 23 17:25:04 2003  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* eval.c (rb_eval): do not warn discarding already undefined
+	  method.
+
+	* lib/rational.rb: undef quo before replacing.
+
 Thu Jan 23 15:49:57 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* parse.y (arg): missing arguments.
diff --git a/eval.c b/eval.c
index 171eadf0f1..6fcfdb0d56 100644
--- a/eval.c
+++ b/eval.c
@@ -3203,7 +3203,7 @@ rb_eval(self, n)
 	    rb_frozen_class_p(ruby_class);
 	    body = search_method(ruby_class, node->nd_mid, &origin);
 	    if (body){
-		if (RTEST(ruby_verbose) && ruby_class == origin && body->nd_cnt == 0) {
+		if (RTEST(ruby_verbose) && ruby_class == origin && body->nd_cnt == 0 && body->nd_body) {
 		    rb_warning("method redefined; discarding old %s", rb_id2name(node->nd_mid));
 		}
 	    }
diff --git a/lib/rational.rb b/lib/rational.rb
index af4eada071..1e41b9a28a 100644
--- a/lib/rational.rb
+++ b/lib/rational.rb
@@ -317,6 +317,7 @@ class Fixnum
     alias power! **;
   end
   
+  undef quo
   def quo(other)
     Rational.new!(self,1) / other
   end
@@ -339,7 +340,8 @@ class Bignum
   if not defined? power!
     alias power! **
   end
-  
+
+  undef quo
   def quo(other)
     Rational.new!(self,1) / other
   end