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package-nicknames  package ⇒  nicknames
package—a package designator.
nicknames—a list of strings.
Returns the list of nickname strings for package, not including the name of package.
 (package-nicknames (make-package 'temporary
                                   :nicknames '("TEMP" "temp")))
⇒  ("temp" "TEMP") 
Should signal an error of type type-error if package is not a package designator.