AST Unparser can't unparse ext slices correctly

[isidentical]

BPO	39520
Nosy	@pablogsal, @miss-islington, @isidentical
PRs	bpo-39520: Fix unparsing of ext slices with no dimentions #18304 [3.7] bpo-39520: Fix un-parsing of ext slices with no dimensions (GH-18304) #18940 [3.8] bpo-39520: Fix un-parsing of ext slices with no dimensions (GH-18304) #18941

^{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 2020-03-04.19:45:25.492>
created_at = <Date 2020-02-01.21:10:07.663>
labels = ['interpreter-core', '3.8', 'type-bug', '3.7', '3.9']
title = "AST Unparser can't unparse ext slices correctly"
updated_at = <Date 2020-03-11.20:18:04.495>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-03-11.20:18:04.495>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2020-03-04.19:45:25.492>
closer = 'BTaskaya'
components = ['Interpreter Core']
creation = <Date 2020-02-01.21:10:07.663>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 39520
keywords = ['patch']
message_count = 4.0
messages = ['361193', '363086', '363962', '363963']
nosy_count = 3.0
nosy_names = ['pablogsal', 'miss-islington', 'BTaskaya']
pr_nums = ['18304', '18940', '18941']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39520'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[isidentical]

(this issue has already a PR for ast.unparse)

>>> from __future__ import annotations
>>> import ast
>>> x: Tuple[1:2,] = 3
>>> __annotations__["x"]
'Tuple[1:2]'
>>> ast.dump(ast.parse("Tuple[1:2,]"))
"Module(body=[Expr(value=Subscript(value=Name(id='Tuple', ctx=Load()), slice=ExtSlice(dims=[Slice(lower=Constant(value=1, kind=None), upper=Constant(value=2, kind=None), step=None)]), ctx=Load()))], type_ignores=[])"

>>> ast.dump(ast.parse("Tuple[1:2]"))
"Module(body=[Expr(value=Subscript(value=Name(id='Tuple', ctx=Load()), slice=Slice(lower=Constant(value=1, kind=None), upper=Constant(value=2, kind=None), step=None), ctx=Load()))], type_ignores=[])"

[pablogsal]

New changeset 185903d by Batuhan Taşkaya in branch 'master':
bpo-39520: Fix un-parsing of ext slices with no dimensions (GH-18304)
185903d

[miss-islington]

New changeset d0837d2 by Miss Islington (bot) in branch '3.7':
bpo-39520: Fix un-parsing of ext slices with no dimensions (GH-18304)
d0837d2

[miss-islington]

New changeset cd07b4d by Miss Islington (bot) in branch '3.8':
bpo-39520: Fix un-parsing of ext slices with no dimensions (GH-18304)
cd07b4d