2 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index 9eaf3b7623..dfdbae66b0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan  9 22:04:17 2008  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
+
+	* lib/mathn.rb (Prime#each): returns an enumerator if no block
+	  given. [ruby-dev:32815]
+
 Wed Jan  9 22:03:26 2008  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* encoding.c (rb_enc_replicate): replica of dummy is a dummy.
diff --git a/lib/mathn.rb b/lib/mathn.rb
index 1c68a4bb03..3e24dd03f3 100644
--- a/lib/mathn.rb
+++ b/lib/mathn.rb
@@ -101,6 +101,7 @@ class Prime
   alias next succ
 
   def each
+    return to_enum(:each) unless block_given?
     loop do
       yield succ
     end