Here is minimized example.

from email._header_value_parser import *
al = AddressList([Address([Mailbox([NameAddr([DisplayName([Atom([ValueTerminal('example', 'atext'), CFWSList([WhiteSpaceTerminal('\t', 'fws')])])]), AngleAddr([ValueTerminal('<', 'angle-addr-start'), AddrSpec([LocalPart([DotAtom([DotAtomText([ValueTerminal('very-very-very-very-very-very-very-very-very-very-very-very-long', 'atext')])])]), ValueTerminal('@', 'address-at-symbol'), Domain([DotAtom([DotAtomText([ValueTerminal('example', 'atext'), ValueTerminal('.', 'dot'), ValueTerminal('org', 'atext')])])])]), ValueTerminal('>', 'angle-addr-end')])])])]), ValueTerminal(',', 'list-separator'), Address([Mailbox([NameAddr([AngleAddr([CFWSList([WhiteSpaceTerminal('\t', 'fws')]), ValueTerminal('<', 'angle-addr-start'), AddrSpec([LocalPart([DotAtom([DotAtomText([ValueTerminal('very-very-very-very-very-very-very-very-very-very-very-very-long', 'atext')])])]), ValueTerminal('@', 'address-at-symbol'), Domain([DotAtom([DotAtomText([ValueTerminal('example', 'atext'), ValueTerminal('.', 'dot'), ValueTerminal('org', 'atext')])])])]), ValueTerminal('>', 'angle-addr-end')])])])])])
import email.policy
al.fold(policy=email.policy.default)