Remove unused assignments

Author: mark-rushakoff

actionpack/lib/action_dispatch/middleware/cookies.rb

@@ -339,7 +339,6 @@ def initialize(app)
     end
 
     def call(env)
-      cookie_jar = nil
       status, headers, body = @app.call(env)
 
       if cookie_jar = env['action_dispatch.cookies']

activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

@@ -286,12 +286,10 @@ def reap
       private
 
       def release(conn)
-        thread_id = nil
-
-        if @reserved_connections[current_connection_id] == conn
-          thread_id = current_connection_id
+        thread_id = if @reserved_connections[current_connection_id] == conn
+          current_connection_id
         else
-          thread_id = @reserved_connections.keys.find { |k|
+          @reserved_connections.keys.find { |k|
             @reserved_connections[k] == conn
           }
         end

activesupport/lib/active_support/testing/performance/jruby.rb

@@ -42,7 +42,7 @@ def record
           klasses.each do |klass|
             fname = output_filename(klass)
             FileUtils.mkdir_p(File.dirname(fname))
-            file = File.open(fname, 'wb') do |file|
+            File.open(fname, 'wb') do |file|
               klass.new(@data).printProfile(file)
             end
           end

railties/lib/rails/commands/runner.rb

@@ -9,7 +9,6 @@
 end
 
 ARGV.clone.options do |opts|
-  script_name = File.basename($0)
   opts.banner = "Usage: runner [options] ('Some.ruby(code)' or a filename)"
 
   opts.separator ""