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rename-package  package new-name &optional new-nicknames ⇒  package-object
package—a package designator.
new-name—a package designator.
new-nicknames—a list of string designators. The default is the empty list.
package-object—the renamed package object.
Replaces the name and nicknames of package. The old name and all of the old nicknames of package are eliminated and are replaced by new-name and new-nicknames.
The consequences are undefined if new-name or any new-nickname conflicts with any existing package names.
 (make-package 'temporary :nicknames '("TEMP")) ⇒  #<PACKAGE "TEMPORARY">
 (rename-package 'temp 'ephemeral) ⇒  #<PACKAGE "EPHEMERAL">
 (package-nicknames (find-package 'ephemeral)) ⇒  ()
 (find-package 'temporary) ⇒  NIL
 (rename-package 'ephemeral 'temporary '(temp fleeting))
⇒  #<PACKAGE "TEMPORARY">
 (package-nicknames (find-package 'temp)) ⇒  ("TEMP" "FLEETING")