Methods
C
Class Public methods
compile_methods!(keys)

compiles reader methods so we don’t have to go through method_missing

Source: show 

# File activesupport/lib/active_support/configurable.rb, line 19
      def self.compile_methods!(keys)
        keys.reject { |m| method_defined?(m) }.each do |key|
          class_eval "            def #{key}; _get(#{key.inspect}); end
", __FILE__, __LINE__ + 1
        end
      end
Instance Public methods
compile_methods!()

Source: show 

# File activesupport/lib/active_support/configurable.rb, line 14
def compile_methods!
  self.class.compile_methods!(keys)
end