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packages-to-use—a designator for
a list of package designators.
KEYWORD package may not be supplied.
package—a package designator.
The default is the current package.
The package cannot be the
use-package causes package to inherit all the
external symbols of packages-to-use.
The inherited symbols become accessible as
internal symbols of package.
Packages-to-use are added to the use list of package
if they are not there already. All external symbols in
packages-to-use become accessible in package
as internal symbols.
use-package does not cause any new symbols to be present
in package but only makes them accessible by inheritance.
use-package checks for
name conflicts between the newly imported symbols and those already
accessible in package.
A name conflict in
between two external symbols inherited
by package from packages-to-use may be resolved in favor of
by importing one of them into package and making it a
(export (intern "LAND-FILL" (make-package 'trash)) 'trash) → T (find-symbol "LAND-FILL" (make-package 'temp)) → NIL, NIL (package-use-list 'temp) → (#<PACKAGE "TEMP">) (use-package 'trash 'temp) → T (package-use-list 'temp) → (#<PACKAGE "TEMP"> #<PACKAGE "TRASH">) (find-symbol "LAND-FILL" 'temp) → TRASH:LAND-FILL, :INHERITED
The use list of package may be modified.
unuse-package, package-use-list, Section 11.1 (Package Concepts)
It is permissible for a package P1
to use a package P2
even if P2 already uses P1. The using of packages is not transitive, so no problem results from the apparent circularity.