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Subject: |
evaluating `'#'(lambda (b) b)8 ; => 8 with `eval-last-sexp' "C-x C-e" in `emacs-lisp-mode' |
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Date: |
Sat, 21 Aug 2010 17:55:03 -0400 |
Interactive invocation of `eval-last-sexp' (e.g. "C-x C-e" ) in
Emacs-lisp mode buffer for this form:
`'#'(lambda (b) b)8
;=> 8
`eval-last-sexp' for this makes (some) sense:
`'#'(lambda (b) b)
;=> (quote (function (lambda (b) b)))
And so, presumably the above is equivalent to:
(eval '(list 'quote '(function (lambda (b) b))))
;=> (quote (function (lambda (b) b)))
But what is the equivalent form which would explain the results for
following:
`'#'(lambda (b) b)8
;=> 8
Surely it isn't this:
(funcall (eval (eval (eval '(list 'quote '(function (lambda (b) b)))))) 8)
;=> 8
If it is, then why is eval'ing the same `'#'(lambda (b) b)8 form with
`eval-expression' (e.g. "M-:") met with the message:
"Trailing garbage following expression"
Likewise, giving `eval-expression' this form lands me in the debugger:
(`'#'(lambda (b) b) 8)
;=> Debugger entered--Lisp error:
(wrong-number-of-arguments #[(structure) "\301!A\207"
[structure backquote-process] 2 1720176] 2)
Reproducable on 23.2 with emacs -Q
--
/s_P\
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--- Begin Message ---
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Subject: |
Re: bug#6893: evaluating `'#'(lambda (b) b)8 ; => 8 with `eval-last-sexp' "C-x C-e" in `emacs-lisp-mode' |
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Date: |
Sun, 22 Aug 2010 00:40:17 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
> Interactive invocation of `eval-last-sexp' (e.g. "C-x C-e" ) in
> Emacs-lisp mode buffer for this form:
> `'#'(lambda (b) b)8
> ;=> 8
C-x C-e doesn't evaluate "the expression on the line" but "the last sexp
before point".
The "last-sexp" is just "8" (try C-M-b to see what it is), so whatever
other sexp you put before won't make any difference.
Stefan
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