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

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

OK, here is a single patch (from `hg outgoing --patch`) that fixes all the tests by introducing the test.support.no_tracing decorator.

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Added file: http://bugs.python.org/file20523/trace_fxn_protected.diff

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