Re: Mysterious fontification/C++ context issue

[Chong Yidong]

Stefan Monnier <address@hidden> writes:

> The docstring doesn't mention anything about it.  And really, when
> defun-prompt-regexp is nil, then beginning-of-defun considers that "defun
> starts when there is a char with open-parenthesis syntax at the beginning of
> a line".  So if open-paren-in-column-0-is-defun-start is nil, it's hard to
> figure out what should be considered as a defun start.
>
> It's kind of like saying "I won't tell you what it is, I'll just tell you
> that it's not what you think".

We could explicitly document that this situation (defun-prompt-regexp
and o-p-i-c-0-i-d-s both nil) means "figure it out using
syntactically", i.e. using ppss as Alan implemented.

We have to bring this to a resolution; intricate changes can be
postphone till after the release.  I recommend the following:

* Updating the relevant docstrings to say what defun-prompt-regexp and
  o-p-i-c-0-i-d-s both nil means.

* Updating the Elisp manual, and mentioning that such a combination
  can be slow.

* Checking in Martin's optimization to Alan's code.

* Setting o-p-i-c-0-i-d-s to t for cc mode.