Bug is recent math library changes

[Joseph S. Myers]

Please file a bug in Bugzilla, making sure to start what architecture or 
architectures the issue is observed on (different architectures use 
different pow implementations).

pow_test is a 700-line function that's not very well sorted and it appears 
you've found a case missing from it - it could probably do with being 
sorted more systematically according to whether the arguments are NaN, 
+-Inf, +-1, +-0, other finite values.

-- 
Joseph S. Myers
joseph@codesourcery.com