```ruby
require 'rubygems'
require 'bundler'

Bundler.require :default, :development

Combustion.initialize!
run Combustion::Application
```

Fix for Combustion's generated rackup file.
user
```ruby
require 'rubygems'
require 'bundler'

Bundler.require :default, :development

Combustion.initialize! :all
run Combustion::Application
```
assistant