Sven Brauch <svenbra...@googlemail.com> added the comment:

Hi,

I found the reason for this behavior in the code now, it's in Python/ast.c, 
lines 1745 and 1746 in ast_for_power():

        tmp->lineno = e->lineno;
        tmp->col_offset = e->col_offset;

Here, the range information for the individual attributes (which is correctly 
set before!) is being discarded and replaced by the useless information from 
the expression ast.
I don't see any reason for this, is there one? :)

Removing those two lines doesn't seem to break anything and sets ranges 
correctly.

Best regards,
Sven

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<http://bugs.python.org/issue10769>
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