_ast py3k : add lineno back to "args" node

[emileanclin]

BPO	10445
Nosy	@ncoghlan, @benjaminp, @PCManticore

^{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 2014-06-28.14:12:10.196>
created_at = <Date 2010-11-17.14:15:24.769>
labels = ['interpreter-core', 'type-bug']
title = '_ast py3k : add lineno back to "args" node'
updated_at = <Date 2014-06-28.14:12:10.194>
user = 'https://bugs.python.org/emileanclin'

bugs.python.org fields:

activity = <Date 2014-06-28.14:12:10.194>
actor = 'Claudiu.Popa'
assignee = 'none'
closed = True
closed_date = <Date 2014-06-28.14:12:10.196>
closer = 'Claudiu.Popa'
components = ['Interpreter Core']
creation = <Date 2010-11-17.14:15:24.769>
creator = 'emile.anclin'
dependencies = []
files = []
hgrepos = []
issue_num = 10445
keywords = []
message_count = 3.0
messages = ['121357', '220342', '221791']
nosy_count = 4.0
nosy_names = ['ncoghlan', 'benjamin.peterson', 'Claudiu.Popa', 'emile.anclin']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue10445'
versions = ['Python 3.2', 'Python 3.3', 'Python 3.4']

[emileanclin]

For Python3x, in the tree generated by _ast, for the "args" node (representing an argument of a function), the "lineno" (and the "col_offset") information disappeared from those nodes.

It would be nice to have them back (for instance for Pylint)

[PCManticore]

This doesn't seem to be the case for Python 3.4. Also, _ast.arguments didn't have "lineno" and "col_offset" attributes neither in Python 2. But the _arg.arg nodes have those attributes, as seen in this example.

>>> from ast import parse
>>> parse("""
... def test(a): pass
... """)
<_ast.Module object at 0x02E43330>
>>> f=_
>>> f.body[0].args
<_ast.arguments object at 0x02E43390>
>>> f.body[0].args.lineno
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'arguments' object has no attribute 'lineno'
>>> f.body[0].args.args
[<_ast.arg object at 0x02E43270>]
>>> f.body[0].args.args[0].lineno
2
>>>

[PCManticore]

It seems that this was actual the case for Python 3.2 and 3.3, but fixed in 3.4. Unfortunately, it's too late now to add those fields back, since 3.2 and 3.3 receives only security updates. So I guess this issue can be closed.