# File lib/coercible/configuration.rb, line 14
    def self.build(keys, &block)
      config = new
      keys.each do |key|
        config.instance_eval "def \#{key}\n@\#{key}\nend\n\ndef \#{key}=(value)\n@\#{key} = value\nend\n"
      end
      yield(config) if block_given?
      config
    end