Mark Dickinson <dicki...@gmail.com> added the comment:

> That would probably be because exp(-infinity) is 0, which isn't a
> floating-point special value, and ln(-infinity) is NaN, which is.

Actually, looking at the code, mpd_setspecial is called under exactly the same 
circumstances (namely for +inf) in *both* cases; for -inf, the exp code calls 
_settriple, while the ln code calls mpd_seterror.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15107>
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