chef

https://github.com/opscode/chef

Ruby

A systems integration framework, built to bring the benefits of configuration management to your entire infrastructure.

Chef::Decorator#method_missing

this is the ruby 2.2/2.3 implementation of Delegator#method_missing() with
adding the define_singleton_method call and @__defined_methods__ tracking

Source | Google | Stack overflow

Edit

git clone [email protected]:opscode/chef.git
cd chef
open lib/chef/decorator.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Chef--Decorator-method_missing-for-pr

# Commit to git
git add lib/chef/decorator.rbgit commit -m "better docs for Chef::Decorator#method_missing"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Chef--Decorator-method_missing-for-pr
hub pull-request

# Celebrate!