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list-all-packages  <no arguments> ⇒  packages
packages—a list of package objects.
list-all-packages returns a
fresh
list of
all registered packages.
 (let ((before (list-all-packages)))
    (make-package 'temp)
    (set-difference (list-all-packages) before)) ⇒  (#<PACKAGE "TEMP">)
defpackage, delete-package, make-package