diff --git a/ChangeLog b/ChangeLog
index 3cfa8c5b83..e09463a47b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Mon Aug  9 15:59:02 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/rubygems/source_index.rb: rename unused variable.
+
+	* lib/rubygems/specification.rb: rename unused variable.
+
+	* lib/rubygems/specification.rb: remove unused variable.
+
 Mon Aug  9 14:10:06 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/nkf/nkf-utf8/nkf.c: Fix type of mimeout_state.buf.
diff --git a/lib/rubygems/source_index.rb b/lib/rubygems/source_index.rb
index f9b8ea0f81..4700fbbb89 100644
--- a/lib/rubygems/source_index.rb
+++ b/lib/rubygems/source_index.rb
@@ -357,7 +357,7 @@ class Gem::SourceIndex
       begin
         fetcher = Gem::SpecFetcher.fetcher
         remotes = fetcher.find_matching dependency
-        remotes = remotes.map { |(name, version,_),_| version }
+        remotes = remotes.map { |(_,version,_),_| version }
       rescue Gem::RemoteFetcher::FetchError => e
         raise unless fetcher.warn_legacy e do
           require 'rubygems/source_info_cache'
diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 4c5a02d39c..c9a4a0c640 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -671,7 +671,7 @@ class Gem::Specification
   private :same_attributes?
 
   def hash # :nodoc:
-    @@attributes.inject(0) { |hash_code, (name, default_value)|
+    @@attributes.inject(0) { |hash_code, (name, _)|
       n = self.send(name).hash
       hash_code + n
     }
@@ -703,7 +703,7 @@ class Gem::Specification
   def to_yaml(opts = {}) # :nodoc:
     return super if YAML.const_defined?(:ENGINE) && !YAML::ENGINE.syck?
 
-    yaml = YAML.quick_emit object_id, opts do |out|
+    YAML.quick_emit object_id, opts do |out|
       out.map taguri, to_yaml_style do |map|
         encode_with map
       end