;; here is code to test by, description in comments
(require 'cl)
;; lexical let is supposed to use fake lexical binding
;; to imitate closure behavior in CL
;; so, this in emacs lisp:
(apply (lexical-let ((x 3) (y 4))
(lambda (x) (+ x y))) '(1)) ;; in EL returns 7
;; should behave like this in CL
(apply (let ((x 3) (y 4))
(lambda (x) (+ x y))) '(1)) ;; in CL returns 5 (SBCL)
;; however in emacs lisp, the lambda arg x is forgetton and
;; the lexical-let bound x is used in the lambda, not the arg.
I assume this is not the desired behavior.
In GNU Emacs 24.3.1 (i386-mingw-nt6.2.9200)
of 2013-03-17 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.2.9200
Configured using:
`configure --with-gcc (4.7) --cflags
-ID:/devel/emacs/libs/libXpm-3.5.8/include
-ID:/devel/emacs/libs/libXpm-3.5.8/src
-ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
-ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
-ID:/devel/emacs/libs/giflib-4.1.4-1/include
-ID:/devel/emacs/libs/jpeg-6b-4/include
-ID:/devel/emacs/libs/tiff-3.8.2-1/include
-ID:/devel/emacs/libs/gnutls-3.0.9/include
-ID:/devel/emacs/libs/libiconv-1.13.1-1-dev/include
-ID:/devel/emacs/libs/libxml2-2.7.8/include/libxml2'
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value of $LANG: ENU
locale-coding-system: cp1252
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Recent input:
d SPC b a h a <backspace> <backspace> <backspace> e
h a v e SPC l i k e SPC t h i s SPC i n SPC C : <backspace>
l <backspace> L C-n C-n C-e <return> <return> ; ; SPC
h o w e v e r SPC i n SPC e m a c s SPC l i s p , SPC
t h e SPC l a m b d a SPC a r e <backspace> g SPC x
SPC i s SPC f o r g e t t o n SPC a n d <return> <tab>
; ; SPC t h e SPC l e x i c a l - l e t SPC b o u n
d SPC x SPC i s SPC u s e d SPC i n SPC t h e SPC l
a m b d a . C-p C-p C-e C-p C-e SPC ; ; SPC i n SPC
C L S-SPC r e t u r n s SPC 5 C-p C-p C-p C-p C-p C-n
C-e SPC ; ; SPC i n SPC E L SPC r e t u r n s SPC 7
C-p C-p C-p C-p C-n C-n C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-p C-e <backspace> SPC n o t SPC t h e
SPC a r g . C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b
C-b C-b C-b , C-e M-x C-g C-p C-p C-p C-e SPC ( S B
C L ) C-n C-n C-n C-n C-e M-x e m a c s - b u <tab>
<tab> <backspace> <backspace> r e <tab> <tab> <tab>
<backspace> <backspace> <tab> <tab> <tab> C-a C-k r
e p o <tab> <tab> r <tab> <return>
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