config.ru
---------

require 'rubygems'
require 'sinatra'
require 'main'
require 'rack/hoptoad'
require 'sequel'
require 'json'
require 'logger'

use Rack::Hoptoad, 'b6f45e9ce320d8c9d0adf4538317a07a'

disable :run, :reload
set :environment, :development
set :db_host, :localhost
set :db_user, :root
set :db_password

run Sinatra::Application


main.rb
-------

configure do
  database = "cms_#{settings.environment.to_s}"   #crash!!!
  DB = Sequel.connect(:adapter => 'mysql', :host => 'localhost', :database => database, :user => 'root', :password => '')
end


the error
---------
SystemStackError: stack level too deep

(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'
(__DELEGATE__):2:in `send'
(__DELEGATE__):2:in `settings'