[issue17611] Move unwinding of stack for "pseudo exceptions" from interpreter to compiler.

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

While there are some good comments in line in the PR, I think it would be helpful if these changes were accompanied by some additions to https://devguide.python.org/compiler/ that explain how the various pieces of the solution work together to manage the execution stack.

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<https://bugs.python.org/issue17611>
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