[issue4273] cycle created by profile.run

[darrenr]

darrenr <python-roundup at dranalli.com> added the comment:

The profile module creates a reference cycle. See attached session.

Note: cycle can be broken by deleting reference to 'dispatcher' on 
profile.Profile() instance.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4273>
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