[issue15005] trace corrupts return result on chained execution

[anatoly techtonik]

anatoly techtonik added the comment:

The trace module helps to gather program flow statistics and see the differences in patterns for large systems when program evolves. In particular, components ported to Python 3 should still behave the same way on Python 2.

Right now the behavior under the trace is broken.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15005>
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