os.symlink: FileExistsError shows wrong message

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-02-26.08:52:24.286>
labels = ['interpreter-core', 'type-bug', '3.8', '3.9', '3.10', 'extension-modules']
title = 'os.symlink: FileExistsError shows wrong message'
updated_at = <Date 2021-05-01.14:08:17.914>
user = 'https://bugs.python.org/wrohdewald'

bugs.python.org fields:

activity = <Date 2021-05-01.14:08:17.914>
actor = 'Yonatan Goldschmidt'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules', 'Interpreter Core']
creation = <Date 2017-02-26.08:52:24.286>
creator = 'wrohdewald'
dependencies = []
files = ['46671']
hgrepos = []
issue_num = 29657
keywords = []
message_count = 12.0
messages = ['288591', '288592', '288906', '288936', '288947', '288963', '288971', '289064', '296270', '296273', '330827', '392598']
nosy_count = 10.0
nosy_names = ['larry', 'wrohdewald', 'serhiy.storchaka', 'eryksun', 'sayanchowdhury', 'xiang.zhang', 'andrewnester', 'miserlou', 'Yonatan Goldschmidt', 'kamilturek']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue29657'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']