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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.

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>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 ;-)

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Fixed for 2.5. Thanks for the bug report.
Committed revision 41767.