[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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title: Extracting tracebacks does too much work -> traceback: add a new thin class storing a traceback without storing local variables

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17911>
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