Suppose I have the following: In the REPL: > (struct exn:fail:db exn:fail ()) > (struct exn:fail:db:num-rows exn:fail:db ()) > (struct exn:fail:db:num-rows:zero exn:fail:db:num-rows <...something...>) > (define failed (exn:fail:db:num-rows:zero)) > (exn? failed) #t > (exn:fail:db? failed) #t > (exn:fail:db:num-rows:zero? failed) #t > (println (exn-message failed)) "zero rows found"
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