It seems like too many :refer :all are used for some testing files. In addition, I'm not so sure if all the imports are actually used. For instance, the below code imports errors.prettify_exception in two different places.
(ns exception_msgs.overwritten_fns.seq_ops
(:use [errors.prettify_exception :only [line-number-format]])
(:require [expectations :refer :all]
[errors.messageobj :refer :all]
[errors.testing_tools :refer :all]
[errors.prettify_exception :refer :all]
[utilities.file_IO :refer :all]
))