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> This seems to me to be a significant decrease in the environment's or
> sandbox's ability to control what happens in error cases. In my own
> project, I am not even sure I can handle this safely; if the environment
> can't exert any control over this feature, it might be impossible for me
> to support 5.4 at all, which would be a great shame.

Can you give a more concrete example of how that would be a problem?

Would it be better to keep the original error after running the closing

(We have no strong reasons to raise the last error instead of the first
one; this is just how "most" languages (at least Java :-) do.)

-- Roberto