* bug#4290: 23.1; (elisp)Anonymous Functions - unclear about #'
@ 2009-09-12 2:02 Chong Yidong
0 siblings, 0 replies; 4+ messages in thread
From: Chong Yidong @ 2009-09-12 2:02 UTC (permalink / raw)
To: Drew Adams; +Cc: 4290, emacs-devel
> This Info node is unclear. It combines pre-Emacs 22 text that
> explicitly says that lambda forms are *not* byte-compiled unless you
> use `#'' or `function', with this statement that says that they are:
> Nowadays it is possible to omit `function' entirely, like this:
> (defun double-property (symbol prop)
> (change-property symbol prop (lambda (x) (* 2 x))))
> This is because `lambda' itself implies `function'.
Thanks for spotting this.
Hmm---is `function' still useful for anything?
^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#4290: 23.1; (elisp)Anonymous Functions - unclear about #'
@ 2009-08-29 21:07 Drew Adams
0 siblings, 0 replies; 4+ messages in thread
From: Drew Adams @ 2009-08-29 21:07 UTC (permalink / raw)
To: bug-gnu-emacs
This Info node is unclear. It combines pre-Emacs 22 text that
explicitly says that lambda forms are *not* byte-compiled unless you
use `#'' or `function', with this statement that says that they are:
Nowadays it is possible to omit `function' entirely, like this:
(defun double-property (symbol prop)
(change-property symbol prop (lambda (x) (* 2 x))))
This is because `lambda' itself implies `function'.
What should be said is something like this:
"Starting with Emacs 22, a lambda form is byte-compiled when it is used
as a function, regardless of whether it is preceded by `function' or
`#''. With Emacs versions prior to 22, you must explicitly use `#''
or `function' if you want the form to be byte-compiled."
This means rewording or replacing the paragraph that says that unless
you use `function' a lambda form won't be byte-compiled. The example
and its accompanying text need to be clarified.
In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'
^ permalink raw reply [flat|nested] 4+ messages in thread
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2009-09-12 6:13 ` bug#4290: 23.1; (elisp)Anonymous Functions - unclear about #' Drew Adams
2009-09-12 19:41 ` Stefan Monnier
2009-09-12 2:02 Chong Yidong
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2009-08-29 21:07 Drew Adams
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