dataclasses should look up __set_name__ on class, not instance

[ericvsmith]

BPO	33175
Nosy	@ericvsmith, @miss-islington
PRs	bpo-33175: dataclasses should look up __set_name__ on class, not instance #6305 [3.7] bpo-33175: dataclasses should look up __set_name__ on class, not instance (GH-6305) #6309

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ericvsmith'
closed_at = <Date 2018-03-29.17:33:46.346>
created_at = <Date 2018-03-29.08:11:13.211>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'dataclasses should look up __set_name__ on class, not instance'
updated_at = <Date 2018-03-29.17:33:46.323>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2018-03-29.17:33:46.323>
actor = 'eric.smith'
assignee = 'eric.smith'
closed = True
closed_date = <Date 2018-03-29.17:33:46.346>
closer = 'eric.smith'
components = ['Library (Lib)']
creation = <Date 2018-03-29.08:11:13.211>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 33175
keywords = ['patch']
message_count = 3.0
messages = ['314636', '314657', '314659']
nosy_count = 2.0
nosy_names = ['eric.smith', 'miss-islington']
pr_nums = ['6305', '6309']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33175'
versions = ['Python 3.7', 'Python 3.8']

[ericvsmith]

Reported by Jelle Zijlstra at #6260 (review)

[ericvsmith]

New changeset 5219952 by Eric V. Smith in branch 'master':
bpo-33175: dataclasses should look up __set_name__ on class, not instance (GH-6305)
5219952

[miss-islington]

New changeset faa6f5c by Miss Islington (bot) in branch '3.7':
bpo-33175: dataclasses should look up __set_name__ on class, not instance (GH-6305)
faa6f5c