Gemfile

source 'http://rubygems.org'

gem 'rails', :git => 'git://github.com/rails/rails.git'
gem 'arel',  :git => 'git://github.com/rails/arel.git'

gem 'pg'

# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# Bundle the extra gems:
# gem 'bj'
# gem 'nokogiri', '1.4.1'
# gem 'sqlite3-ruby', :require => 'sqlite3'
# gem 'aws-s3', :require => 'aws/s3'

# Bundle gems for certain environments:
# gem 'rspec', :group => :test
# group :test do
#   gem 'webrat'
# end

Gemfile.lock

GIT
  remote: git://github.com/rails/arel.git
  revision: e589a1e
  specs:
    arel (0.4.0)
      activesupport (>= 3.0.0.beta)

GIT
  remote: git://github.com/rails/rails.git
  revision: 9024545
  specs:
    actionmailer (3.0.0.beta4)
      actionpack (= 3.0.0.beta4)
      mail (~> 2.2.3)
    actionpack (3.0.0.beta4)
      activemodel (= 3.0.0.beta4)
      activesupport (= 3.0.0.beta4)
      builder (~> 2.1.2)
      erubis (~> 2.6.5)
      i18n (~> 0.4.1)
      rack (~> 1.2.1)
      rack-test (~> 0.5.4)
      tzinfo (~> 0.3.16)
    activemodel (3.0.0.beta4)
      activesupport (= 3.0.0.beta4)
      builder (~> 2.1.2)
      i18n (~> 0.4.1)
    activerecord (3.0.0.beta4)
      activemodel (= 3.0.0.beta4)
      activesupport (= 3.0.0.beta4)
      arel (~> 0.4.0)
      tzinfo (~> 0.3.16)
    activeresource (3.0.0.beta4)
      activemodel (= 3.0.0.beta4)
      activesupport (= 3.0.0.beta4)
    activesupport (3.0.0.beta4)
    rails (3.0.0.beta4)
      actionmailer (= 3.0.0.beta4)
      actionpack (= 3.0.0.beta4)
      activerecord (= 3.0.0.beta4)
      activeresource (= 3.0.0.beta4)
      activesupport (= 3.0.0.beta4)
      bundler (>= 0.9.26)
      railties (= 3.0.0.beta4)
    railties (3.0.0.beta4)
      actionpack (= 3.0.0.beta4)
      activesupport (= 3.0.0.beta4)
      rake (>= 0.8.3)
      thor (~> 0.13.6)

GEM
  remote: http://rubygems.org/
  specs:
    abstract (1.0.0)
    builder (2.1.2)
    bundler (1.0.0.beta.1)
    erubis (2.6.6)
      abstract (>= 1.0.0)
    i18n (0.4.1)
    mail (2.2.5)
      activesupport (>= 2.3.6)
      mime-types
      treetop (>= 1.4.5)
    mime-types (1.16)
    pg (0.9.0)
    pg (0.9.0-x86-mingw32)
    pg (0.9.0-x86-mswin32)
    polyglot (0.3.1)
    rack (1.2.1)
    rack-test (0.5.4)
      rack (>= 1.0)
    rake (0.8.7)
    thor (0.13.7)
    treetop (1.4.8)
      polyglot (>= 0.3.1)
    tzinfo (0.3.22)

PLATFORMS
  ruby

DEPENDENCIES
  arel!
  pg
  rails!

gistfile2.txt

$ ls
Gemfile      README       app          config.ru    doc          log          script       vendor
Gemfile.lock Rakefile     config       db           lib          public       tmp

$ bundle update
Updating git://github.com/rails/rails.git
Updating git://github.com/rails/arel.git
Fetching source index for http://rubygems.org/
/Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:221:in `resolve': undefined method `name' for nil:NilClass (NoMethodError)
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:316:in `block in resolve_requirement'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:315:in `catch'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:315:in `resolve_requirement'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:267:in `block in resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:266:in `reverse_each'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:266:in `resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:150:in `start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:120:in `block in resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:119:in `catch'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:119:in `resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/definition.rb:104:in `resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/definition.rb:65:in `specs'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/definition.rb:61:in `resolve_remotely!'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/installer.rb:19:in `run'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/installer.rb:7:in `install'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/cli.rb:131:in `update'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/task.rb:33:in `run'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/invocation.rb:109:in `block in invoke'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/invocation.rb:116:in `call'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/invocation.rb:116:in `invoke'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor.rb:159:in `block in start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/base.rb:378:in `start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor.rb:138:in `start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/bin/bundle:13:in `<top (required)>'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/bin/bundle:19:in `load'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/bin/bundle:19:in `<main>'

$ git status
#	deleted:    Gemfile.lock

$ ls
Gemfile   README    Rakefile  app       config    config.ru db        doc       lib       log       public    script    tmp       vendor

$ bundle install
Updating git://github.com/rails/rails.git
Updating git://github.com/rails/arel.git
Fetching source index for http://rubygems.org/
/Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:221:in `resolve': undefined method `name' for nil:NilClass (NoMethodError)
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:316:in `block in resolve_requirement'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:315:in `catch'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:315:in `resolve_requirement'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:267:in `block in resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:266:in `reverse_each'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:266:in `resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:150:in `start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:120:in `block in resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:119:in `catch'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/resolver.rb:119:in `resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/definition.rb:104:in `resolve'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/definition.rb:65:in `specs'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/definition.rb:61:in `resolve_remotely!'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/installer.rb:19:in `run'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/installer.rb:7:in `install'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/cli.rb:103:in `install'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/task.rb:33:in `run'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/invocation.rb:109:in `block in invoke'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/invocation.rb:116:in `call'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/invocation.rb:116:in `invoke'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor.rb:159:in `block in start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor/base.rb:378:in `start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/lib/bundler/vendor/thor.rb:138:in `start'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/bundler-1.0.0.beta.1/bin/bundle:13:in `<top (required)>'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/bin/bundle:19:in `load'
	from /Users/msch/.rvm/gems/ruby-1.9.2-preview3@rails3/bin/bundle:19:in `<main>'


$ git checkout Gemfile.lock
$ ls
Gemfile      README       app          config.ru    doc          log          script       vendor
Gemfile.lock Rakefile     config       db           lib          public       tmp

$ bundle install
Updating git://github.com/rails/rails.git
Updating git://github.com/rails/arel.git
Using rake (0.8.7) 
Using abstract (1.0.0) 
Using activesupport (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using builder (2.1.2) 
Using i18n (0.4.1) 
Using activemodel (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using erubis (2.6.6) 
Using rack (1.2.1) 
Using rack-test (0.5.4) 
Using tzinfo (0.3.22) 
Using actionpack (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using mime-types (1.16) 
Using polyglot (0.3.1) 
Using treetop (1.4.8) 
Using mail (2.2.5) 
Using actionmailer (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using arel (0.4.0) from git://github.com/rails/arel.git (at master) 
Using activerecord (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using activeresource (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using bundler (1.0.0.beta.1) 
Using pg (0.9.0) 
Using thor (0.13.7) 
Using railties (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Using rails (3.0.0.beta4) from git://github.com/rails/rails.git (at master) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.