
  [;1m-spec whereis(RegName) -> pid() | port() | undefined[0m
  [;1m                 when RegName :: atom().[0m

  Returns the process identifier or port identifier with the
  registered name [;;4mRegName[0m. Returns [;;4mundefined[0m if the name is not
  registered. Example:

    > whereis(db).
    <0.43.0>
