Serhiy Storchaka added the comment:
Even more minimized artificial example:
from email._header_value_parser import *
import email.policy
tl = TokenList([
TokenList([
ValueTerminal('x', 'atext'),
WhiteSpaceTerminal(' ', 'fws'),
ValueTerminal('x'*76, 'atext'),
]),
ValueTerminal(',', 'list-separator')
])
tl.fold(policy=email.policy.default)
list(tl.parts)[0] == tl and tl.has_fws is True, so TokenList._fold() is called
recursively with the same argument.
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Python tracker <[email protected]>
<http://bugs.python.org/issue22684>
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