Well, I found a way to dodge that need. But still interested in whether
it's possible. Here's my dodge. Ugly and proud.
(defmacro itry
"If expr results in an exception, prompt the user to retry or give
up. The user can execute arbitrary code somewhere else or fiddle with
a DB before retrying. Returns nil if the user gives up."
[expr]
`(loop [result# :success]
(case result#
:no nil
:success (recur
(try ~expr
(catch Exception e#
(-> (ui/dialog
:option-type :yes-no
:content (str "An exception occurred:\n"
e#
"\n\nRetry this step?\n"
'~expr)
:title "Retry?")
ui/pack! ui/show!))))
result#)))
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