[issue10990] tests mutating sys.gettrace() w/o re-instating previous state

[Kristian Vlaardingerbroek]

Changes by Kristian Vlaardingerbroek <kristian.vlaardingerbroek at gmail.com>:


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nosy: +Kristian.Vlaardingerbroek

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10990>
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