Rubinius::ToolSet provides a registry for code tools. These include the Rubinius bytecode compiler and parser. These, in turn, depend on other components like the AST and bytecode emitter and serializer. ToolSets provide a mechanism for other languages to reuse as much of the Rubinius code tools as are suitable for that language.
Gemfile gem 'rubinius-toolset', '~> 2.3.1'
install gem install rubinius-toolset