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(make-local-variable 'buffer-local)
⇒ buffer-local
(setq buffer-local 'value-in-foo) ⇒ value-in-foo
(setq-default buffer-local 'new-default) ⇒ new-default
buffer-local ⇒ value-in-foo
(default-value 'buffer-local) ⇒ new-default
;; ¡Ê¿·¤¿¤Ê¡Ë¥Ð¥Ã¥Õ¥¡‘bar’¤Ç¤Ï¡¢
buffer-local
⇒ new-default
(default-value 'buffer-local) ⇒ new-default
(setq buffer-local 'another-default) ⇒ another-default
(default-value 'buffer-local) ⇒ another-default
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buffer-local
⇒ value-in-foo
(default-value 'buffer-local)
⇒ another-default
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(set-default (car '(a b c)) 23) ⇒ 23
(default-value 'a) ⇒ 23