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Re: [bug]Malformed -*- line

From: Kenichi Handa
Subject: Re: [bug]Malformed -*- line
Date: Wed, 27 Sep 2006 21:42:20 +0900
User-agent: SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.2 Emacs/22.0.50 (i686-pc-linux-gnu) MULE/5.0 (SAKAKI)

In article <address@hidden>, CHENG Gao <address@hidden> writes:

> I bashfully confess I do read manual.

Have you read Elisp info?   This section describes about
"&optional" argument list.

12.2.3 Other Features of Argument Lists

   If actual arguments for the optional and rest variables are omitted,
then they always default to `nil'.  There is no way for the function to
distinguish between an explicit argument of `nil' and an omitted
argument.  However, the body of the function is free to consider `nil'
an abbreviation for some other meaningful value.  This is what
`substring' does; `nil' as the third argument to `substring' means to
use the length of the string supplied.

Kenichi Handa

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