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Gem::Specification.new do |s|
  s.name = "A"
  s.version = "0.0.0"
  s.summary = "Gem A"
end

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module A
  def foo
    "a"
  end

  alias bar foo
end

module B
  def foo

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Generate app

$ rails -m http://gist.github.com/raw/338169/3a1d8e8eb1dde41479d2606019c0df031df7d872/rails23-bundler-template.rb foo
$ cd foo

Add a gem which provides generators to the Gemfile

source :gemcutter
gem 'rails', '2.3.5', :require => nil

gem 'sqlite3-ruby'

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file 'config/preinitializer.rb', <<-PRE
# Use bundled gems
begin
  require File.expand_path('../../.bundle/environment', __FILE__)
rescue LoadError
  # This setup deliberately requires that the application be locked.
  # For an alternative, see http://gist.github.com/302406#file_preinitializer.rb
  if File.exist?(File.expand_path('../../Gemfile.lock', __FILE__))
    raise "Application is locked but not installed.  Run `bundle install` and then try again."
  else

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Installed gems

$ gem list nokogiri

*** LOCAL GEMS ***

nokogiri (1.4.0, 1.3.3)

Gemfile

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gem "rails", "2.3.5"

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# include at least one source and the rails gem
source :gemcutter
gem "rails", "~> 2.3.5", :require => nil
gem "sqlite3-ruby", :require => "sqlite3"

# Devise 1.0.2 is not a valid gem plugin for Rails, so use git until 1.0.3
# gem "devise", :git => "git://github.com/plataformatec/devise.git", :ref => "v1.0"

group :development do
  # bundler requires these gems in development

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def visit(h, incr)
  puts "Visiting #{h.inspect}"
  visited_keys = []
  begin
    h.each_pair do |k, v|
      visited_keys << k
      h[incr.call(k)] = v
      if h.size > 20 # arbitrary limit
        raise "Infinite loop!"
      end

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require 'socket'
require 'webrick/httprequest'
require 'stringio'

# Super-primitive transparent, recording, single-threaded HTTP Proxy
class TransparentHttpProxy
  attr_reader :port

  def initialize(port, recorder)
    @port = port