# File lib/churn/location_mapping.rb, line 51
    def process_defn(exp)
      name        = exp.shift
      start_line  = exp.line
      last_line   = deep_last_line(exp)
      full_name   = "#{@current_class}##{name}"
      @methods_collection[full_name] = [] unless @methods_collection.include?(full_name)
      @methods_collection[full_name] << (start_line..last_line)
      return s(:defn, name, process(exp.shift), process(exp.shift))
    end