float('inf')**2 != inf

[mdonolo]

BPO	7536
Nosy	@tim-one, @mdickinson
Superseder	bpo-7534: float('nan')**2 != nan. float('nan')**2 error 33 on windows

^{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 2009-12-17.19:32:33.641>
created_at = <Date 2009-12-17.19:27:46.335>
labels = ['interpreter-core', 'type-bug']
title = "float('inf')**2 != inf"
updated_at = <Date 2009-12-17.19:32:33.639>
user = 'https://bugs.python.org/mdonolo'

bugs.python.org fields:

activity = <Date 2009-12-17.19:32:33.639>
actor = 'mark.dickinson'
assignee = 'none'
closed = True
closed_date = <Date 2009-12-17.19:32:33.641>
closer = 'mark.dickinson'
components = ['Interpreter Core']
creation = <Date 2009-12-17.19:27:46.335>
creator = 'mdonolo'
dependencies = []
files = []
hgrepos = []
issue_num = 7536
keywords = []
message_count = 2.0
messages = ['96527', '96528']
nosy_count = 3.0
nosy_names = ['tim.peters', 'mark.dickinson', 'mdonolo']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '7534'
type = 'behavior'
url = 'https://bugs.python.org/issue7536'
versions = ['Python 2.6']

[mdonolo]

The ** operator produces an error when it gets inf as an argument.
if I try.
>>>a=float('inf')
>>>a*a 
inf
-but if I try 
>>>a**2 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OverflowError: (34, 'Result too large')
I should get inf too.

[mdickinson]

This is essentially the same issue as bpo-7534, but for infinities
instead of nans. I'm closing this and folding the issue into that one.