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

[Neil Schemenauer]

Neil Schemenauer <nas-python at arctrix.com> added the comment:

Hello Raymond,

I don't have anything ready to go.  PR 4682 has some major outstanding issues.  Specifically, exits from finally bodies did not cleanup the fblock stack correctly.

I still think this patch is a good idea and that it can work.  My goal is to have something that performs better but, more importantly is more understandable from a code maintenance point of view.  I expect it will not be ready for 3.7 however.

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