proc parse(filename: string; altName: string = ""): TConfig {...}{.raises: [
    ValueError, GenericError, IOError, OSError, JsonParsingError, Exception,
    KeyError, ValueError, GenericError, ValueError, GenericError, ValueError,
    GenericError, HttpRequestError, LibraryError, SslError, TimeoutError,
    ProtocolError], tags: [ReadDirEffect, ReadIOEffect, WriteIOEffect,
                           RootEffect, TimeEffect, WriteDirEffect].}