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Proposal for exception handling
I agree with Stephen Adams. The hard part about a condition system is
what is signalled, with what additional data, and when.
The rest is trivial.
After all, I could just (this is not a serious proposal, just pointing
out, along with KMP that control structure is not the issue at all)
(let ((old-raise raise))
(fluid-let ((raise (lambda (condition . data)
(if (my-condition? condition)
<handle the condition>
(apply old-raise condition data)))))