lib2to3 does not support py38 return/yield syntax with starred expressions

[vemel]

BPO	38641
Nosy	@pablogsal, @vemel
PRs	bpo-38641: Add support of starred expressions in return/yield to lib2to3 #16994

^{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 2020-03-01.19:59:46.282>
created_at = <Date 2019-10-30.13:19:43.793>
labels = ['3.8', 'type-feature', 'expert-2to3', '3.9']
title = 'lib2to3 does not support py38 return/yield syntax with starred expressions'
updated_at = <Date 2020-03-01.19:59:46.282>
user = 'https://github.com/vemel'

bugs.python.org fields:

activity = <Date 2020-03-01.19:59:46.282>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2020-03-01.19:59:46.282>
closer = 'pablogsal'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2019-10-30.13:19:43.793>
creator = 'Vlad Emelianov'
dependencies = []
files = []
hgrepos = []
issue_num = 38641
keywords = []
message_count = 2.0
messages = ['355713', '363085']
nosy_count = 2.0
nosy_names = ['pablogsal', 'Vlad Emelianov']
pr_nums = ['16994']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue38641'
versions = ['Python 3.8', 'Python 3.9']

[vemel]

Lib2to3 does not support changes made in https://bugs.python.org/issue32117

def test():
    my_list = ["value2", "value3"]
    yield "value1", *my_list
    return "value1", *my_list

The idea is to use testlist_star_expr instead of testlist.

This is a backwards compatible change, because testlist_star_expr supports test as well like testlist does.

[pablogsal]

New changeset 768d739 by Vlad Emelianov in branch 'master':
bpo-38641: Add lib2to3 support for starred expressions in return/yield statements (GH-16994)
768d739