One comment about having the exception handler 'save state' and restore
it is that frequently the purpose of the exception handler is TO make
changes to outer variable to fix things up based on the exception.

I could see the desire of a way to create an internal scope of sorts and
create names limited to that scope, but wouldn't want such a scope being
anywhere automatic, and likely what would make more sense is defining a
particular name (or names) to have a limited scope.
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