ast_unparser.c doesn't handle PEP570

[pablogsal]

BPO	36961
Nosy	@pablogsal
PRs	bpo-36961: Handle positional-only arguments in uparse.c #13412

^{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/pablogsal'
closed_at = <Date 2019-05-18.22:40:37.155>
created_at = <Date 2019-05-18.22:06:09.837>
labels = ['interpreter-core', '3.8']
title = "ast_unparser.c doesn't handle PEP570"
updated_at = <Date 2019-05-18.22:40:37.154>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2019-05-18.22:40:37.154>
actor = 'pablogsal'
assignee = 'pablogsal'
closed = True
closed_date = <Date 2019-05-18.22:40:37.155>
closer = 'pablogsal'
components = ['Interpreter Core']
creation = <Date 2019-05-18.22:06:09.837>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 36961
keywords = ['patch']
message_count = 2.0
messages = ['342819', '342822']
nosy_count = 1.0
nosy_names = ['pablogsal']
pr_nums = ['13412']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36961'
versions = ['Python 3.8']

[pablogsal]

Any line in test_annotations() containing positional-only markers
in Lib/test/test_future.py will fail:

        eq('lambda x, /: x')

Run tests sequentially
0:00:00 load avg: 0.71 [1/1] test_future
test test_future failed -- Traceback (most recent call last):
  File "/home/pablogsal/github/cpython/Lib/test/test_future.py", line 186, in test_annotations
    eq("lambda a, /, b, c=True, *vararg, d, e='str', **kwargs: a + b")
  File "/home/pablogsal/github/cpython/Lib/test/test_future.py", line 141, in assertAnnotationEqual
    self.assertEqual(actual, expected)
AssertionError: "lambda b, c=True, *vararg, d, e='str', **kwargs: a + b" != "lambda a, /, b, c=True, *vararg, d, e='str', **kwargs: a + b"
- lambda b, c=True, *vararg, d, e='str', **kwargs: a + b
+ lambda a, /, b, c=True, *vararg, d, e='str', **kwargs: a + b
?        ++++++

test_future failed

== Tests result: FAILURE ==

1 test failed:
test_future

Total duration: 46 ms
Tests result: FAILURE

[pablogsal]

New changeset da6129e by Pablo Galindo in branch 'master':
bpo-36961: Handle positional-only arguments in uparse.c (GH-13412)
da6129e