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bug#15538: 24.3; Incorrect Expansion of Nested Backquote

From: 白井 彰
Subject: bug#15538: 24.3; Incorrect Expansion of Nested Backquote
Date: Sun, 6 Oct 2013 20:23:08 +0900

The expansion of nested backquote like




is incorrect.

Please see the following results.

; The followings are from CLtL2 Appendix C. Backquote

(require 'cl-lib)

(setq q '(r s))
(r s)

(defun r (x) (cl-reduce #'* x))

(setq r '(3 5))
(3 5)

(setq s '(4 6))
(4 6)

(\` ((\, (r s))))
(24)                                    ; Correct

(\` ((\,@ (r s))))
24                                      ; Correct

(\` ((\, r s)))
((3 5)) ; Incorrect: This should be ((3 5) (4 6))

(\` ((\,@ r s)))
(3 5) ; Incorrect: This should be (3 5 4 6)

(setq x '(b c))
(b c)

(setq y '(a b))
(a b)

(setq p '(cl-union x y))
(cl-union x y)

(setq q '((cl-union x y) (list 'sqrt 9)))
((cl-union x y) (list (quote sqrt) 9))

(setq r '(cl-union x y))
(cl-union x y)

(setq s '((cl-union x y)))
((cl-union x y))

``(foo ,,p)
(\` (foo (\, (cl-union x y))))
(foo (a b c))                           ; Correct

``(foo ,,@q)
(\` (foo (\, (cl-union x y) (list (quote sqrt) 9))))
(foo (a b c)) ; Incorrect: This should be (foo (a b c) (sqrt 9))

``(foo ,',r)
(\` (foo (\, (quote (cl-union x y)))))
(foo (cl-union x y))                    ; Correct

``(foo ,',@s)
(\` (foo (\, (quote (cl-union x y)))))
(foo (cl-union x y))                    ; Correct

``(foo ,@,p)
(\` (foo (\,@ (cl-union x y))))
(foo a b c)                             ; Correct

``(foo ,@,@q)
(\` (foo (\,@ (cl-union x y) (list (quote sqrt) 9))))
(foo a b c) ; Incorrect: This should be (foo a b c sqrt 9)

``(foo ,@',r)
(\` (foo (\,@ (quote (cl-union x y)))))
(foo cl-union x y)                      ; Correct

``(foo ,@',@s)
(\` (foo (\,@ (quote (cl-union x y)))))
(foo cl-union x y)                      ; Correct

In GNU Emacs 24.3.1 (i386-apple-darwin9.8.0, NS apple-appkit-949.54)
 of 2013-04-30 on mini2.local
Windowing system distributor `Apple', version 10.3.949
Configured using:
 `configure '--with-ns' '--without-x''

Important settings:
  value of $LANG: ja_JP.ujis
  locale-coding-system: japanese-iso-8bit-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - e m a c s - b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

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mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils time-date japan-util tooltip ediff-hook
vc-hooks lisp-float-type mwheel ns-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
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vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs
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