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

[Terry J. Reedy]

Terry J. Reedy added the comment:

Idle is partially disabled in a2 (#23633), with symptoms similar to that of the first example in msg237230.  Trivial test: open Idle Shell, enter '1/0'.  If this is not fixed before .a3, I think it should be reverted until it is.

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nosy: +terry.reedy

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<http://bugs.python.org/issue17911>
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