Line 0 SyntaxWarning with duplicate global declarations

[jeffconnelly]

BPO	889500
Nosy	@terryjreedy

^{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 2005-12-19.04:28:05.000>
created_at = <Date 2004-02-03.04:39:34.000>
labels = ['interpreter-core']
title = 'Line 0 SyntaxWarning with duplicate global declarations'
updated_at = <Date 2005-12-19.04:28:05.000>
user = 'https://bugs.python.org/jeffconnelly'

bugs.python.org fields:

activity = <Date 2005-12-19.04:28:05.000>
actor = 'nnorwitz'
assignee = 'nnorwitz'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2004-02-03.04:39:34.000>
creator = 'jeffconnelly'
dependencies = []
files = []
hgrepos = []
issue_num = 889500
keywords = []
message_count = 3.0
messages = ['19896', '19897', '19898']
nosy_count = 3.0
nosy_names = ['nnorwitz', 'terry.reedy', 'jeffconnelly']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue889500'
versions = ['Python 2.5']

[jeffconnelly]

global a
a = "b"
global a

a.py:0: SyntaxWarning: name 'a' is assigned to before
global declaration

This is a fairly minor bug, however, the message is
misleading (the variable is in fact assigned to both
before and after the global declaration). At least, the
line number should be fixed to refer to the second
declaration, and if possible the error message should
be changed to "duplicate global declaration of 'a'".

P.S.: If "global a" is repeated multiple times, the
error message will be repeated, with the same line
number, and no indication that the warning refers to a
different line.

[terryjreedy]

Logged In: YES
user_id=593130

if possible the error message should
be changed to "duplicate global declaration of 'a'".

The ref man does not prohibit duplicate declarations, nor is
duplication essential to get the misleading line number:

>>> def f():
...   global a
...   b = 0
...   global b
...
<stdin>:1: SyntaxWarning: name 'b' is assigned to before 
global declaration

It appears that compiler treats additional global declarations
as continuations of first and only stores one line #, the first,
for the 'combined' declaration. If code is too difficult to
change, perhaps ref man could make note of this ;-)

[nnorwitz]

Logged In: YES
user_id=33168

Fixed for 2.5. Thanks for the bug report.

Committed revision 41767.