Yes, that solves the problem. Now, I can turn on hs-minor-mode.
But actually the block in my major mode is defined by tags, not by
braces/parentheses, like,
[begin]
   This is the block.
   This is the block.
[end]

accord to the commentary in the hideshow.el file, we can define the BEGIN
and the END of the block by regex, this is what I did,

 (add-to-list 'hs-special-modes-alist '(mymode "\\[begin]" "\\[end]" "#"
nil nil))

However, it doesn't work. Anything else I need to do? or is there other
packages allow me to fold the source where the blocks are defined in this
way?  Thanks.

Shiyuan

On Mon, Oct 15, 2012 at 1:04 PM, Michael Heerdegen <michael_heerdegen@web.de
> wrote:

> Shiyuan <gshy2014@gmail.com> writes:
>
> > I want to turn-on the hide-show-minor-mode in a user-defined
> > mymode. But it gives me the error: mymode doesn't support hide show
> > minor mode. I have put (require 'hideshow) at the beginning of
> > mymode.el, and also
> > (hs-minor-mode 1) in the body of the definition of the major mode, and
> > after that
> > I put (add-to-list 'hs-special-modes-alist '(mymode "{" "}" "/[*/]"
> > nil nil)) in mymode.el.
> >
> > What else I should do to utilize the hs-minor-mode in mymode? Thanks.
>
> Enabling `hs-minor-mode' tests if `comment-start' and `comment-end' are
> bound to something non-nil and fails otherwise.  This happens even
> before `hs-special-modes-alist' is handled.  IMHO this doesn't make much
> sense.  FWIW, your minor-mode must bind `comment-start' and
> `comment-end'.
>
> If your mode doesn't have comments at all, you can bind these to a
> regexp that always fails matching - like "\\=[^[:ascii:][:nonascii:]]".
>
> Does that help?
>
>
> Michael.
>
>