```ruby
# encoding: UTF-8
require 'date'
require 'bigdecimal'
require 'rational' unless RUBY_VERSION >= '1.9.2'

require 'mysql2/version' unless defined? Mysql2::VERSION
require 'mysql2/error'
require 'mysql2/result'
require 'mysql2/mysql2'
require 'mysql2/client'

# = Mysql2
#
# A modern, simple and very fast Mysql library for Ruby - binding to libmysql
module Mysql2
end

if defined?(ActiveRecord::VERSION::STRING) && ActiveRecord::VERSION::STRING < "3.1"
  warn "============= WARNING FROM mysql2 ============="
  warn "This version of mysql2 (#{Mysql2::VERSION}) doesn't ship with the ActiveRecord adapter."
  warn "In Rails version 3.1.0 and up, the mysql2 ActiveRecord adapter is included with rails."
  warn "If you want to use the mysql2 gem with Rails <= 3.0.x, please use the latest mysql2 in the 0.2.x series".
  warn "============= END WARNING FROM mysql2 ============="
end
```

Fix misplaced period in warn
user
```ruby
# encoding: UTF-8
require 'date'
require 'bigdecimal'
require 'rational' unless RUBY_VERSION >= '1.9.2'

require 'mysql2/version' unless defined? Mysql2::VERSION
require 'mysql2/error'
require 'mysql2/result'
require 'mysql2/mysql2'
require 'mysql2/client'

# = Mysql2
#
# A modern, simple and very fast Mysql library for Ruby - binding to libmysql
module Mysql2
end

if defined?(ActiveRecord::VERSION::STRING) && ActiveRecord::VERSION::STRING < "3.1"
  warn "============= WARNING FROM mysql2 ============="
  warn "This version of mysql2 (#{Mysql2::VERSION}) doesn't ship with the ActiveRecord adapter."
  warn "In Rails version 3.1.0 and up, the mysql2 ActiveRecord adapter is included with rails."
  warn "If you want to use the mysql2 gem with Rails <= 3.0.x, please use the latest mysql2 in the 0.2.x series."
  warn "============= END WARNING FROM mysql2 ============="
end
```
assistant