set_display definition allows empty '{' '}' in Language Definition

[dangyogi]

BPO	3917
Nosy	@birkenfeld

^{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/birkenfeld'
closed_at = <Date 2008-09-21.07:10:30.281>
created_at = <Date 2008-09-21.00:37:57.325>
labels = ['docs']
title = "set_display definition allows empty '{' '}' in Language Definition"
updated_at = <Date 2008-09-21.07:10:30.279>
user = 'https://bugs.python.org/dangyogi'

bugs.python.org fields:

activity = <Date 2008-09-21.07:10:30.279>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2008-09-21.07:10:30.281>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2008-09-21.00:37:57.325>
creator = 'dangyogi'
dependencies = []
files = []
hgrepos = []
issue_num = 3917
keywords = []
message_count = 2.0
messages = ['73478', '73485']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'dangyogi']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue3917'
versions = ['Python 3.0']

[dangyogi]

The definition for set_display in the Language Definition allows for
empty curly braces by enclosing expression_list | comprehension in
brackets ('[', ']'). These brackets should be removed, as empty curly
braces are a dict_display.

http://docs.python.org/dev/3.0/reference/expressions.html#grammar-token-set_display

[birkenfeld]

Thanks, fixed in r66522. Also removed the last two paragraphs of the set
display explanation which were pasted from genexps and made no sense,
and added a sentence about {} not constructing a set.