Using wrap-evt and handle-evt, I can transform the synchronization result 
of an event. But events can throw exceptions when they're synchronized. Is 
there a way to wrap an event such that the wrapper can catch (and maybe 
reraise) any exceptions thrown by the wrapped event? I know I can wrap a 
(sync evt) call in a with-handlers block, but that just synchronizes on the 
event instead of wrapping it and producing a new event.

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