remove wrapping of __set_name__ exceptions in RuntimeError

[carljm]

BPO	33577
Nosy	@carljm

^{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 = None
closed_at = <Date 2018-05-19.05:43:22.815>
created_at = <Date 2018-05-19.05:41:49.927>
labels = ['interpreter-core', '3.8']
title = 'remove wrapping of __set_name__ exceptions in RuntimeError'
updated_at = <Date 2018-05-19.05:43:22.814>
user = 'https://github.com/carljm'

bugs.python.org fields:

activity = <Date 2018-05-19.05:43:22.814>
actor = 'carljm'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-19.05:43:22.815>
closer = 'carljm'
components = ['Interpreter Core']
creation = <Date 2018-05-19.05:41:49.927>
creator = 'carljm'
dependencies = []
files = []
hgrepos = []
issue_num = 33577
keywords = []
message_count = 2.0
messages = ['317099', '317102']
nosy_count = 1.0
nosy_names = ['carljm']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue33577'
versions = ['Python 3.8']

[carljm]

Per Nick Coghlan in discussion on bpo-21145:

"I think it would make sense to remove the exception wrapping from the __set_name__ calls - I don't think we're improving the ease of understanding the tracebacks by converting everything to a generic RuntimeError, and we're hurting the UX of descriptor validation cases like this one."

https://github.com/python/cpython/blob/master/Objects/typeobject.c#L7263

[carljm]

Oops, duplicate of bpo-33576.