Creates or associates to an existing expectation hash the :has-args key with
a value corresponding to a function that will either return true if its
argument expectations are met or throw an exception with the details of the
first failed argument it encounters.
Only specify as many predicates as you are interested in verifying. The rest
of the values are safely ignored.
Usage:
(has-args [arg-pred-1 arg-pred-2 ... arg-pred-n] expectation-hash?)
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