# File lib/snmp/mib.rb, line 145
    def load_module(module_name, mib_dir=DEFAULT_MIB_PATH)
      oid_hash = nil
      File.open(MIB.module_file_name(module_name, mib_dir)) do |file|
        oid_hash = YAML.load(file.read)
      end
      @by_name.merge!(oid_hash) do |key, old, value|
        warn "warning: overwriting old MIB name '#{key}'"
      end
      @by_module_by_name[module_name] = {}
      @by_module_by_name[module_name].merge!(oid_hash)
    end