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bug#20732: in-string-p fails

From: Dmitry Gutov
Subject: bug#20732: in-string-p fails
Date: Fri, 5 Jun 2015 23:06:34 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0

On 06/05/2015 06:18 PM, Stefan Monnier wrote:

Makes no sense.  The simpler solution is to make syntax-ppss let-bind
open-paren-in-column-0-is-defun-start.  After all, this variable's
optimization is not useful for syntax-ppss (which already optimizes the
same kinds of things but in a different way); it's only useful for
things like back_comment (i.e. things like backward-sexp, or
forward-comment with a negative argument).

Actually, (nth 3 (syntax-ppss)) in an Elisp buffer doesn't suffer from the same problem as (in-string-p) since bug#16247 was fixed, and syntax-begin-function is nil there. So a simple fix would be to replace the definition of the latter with the former.

We can bind open-paren-in-column-0-is-defun-start to nil, but if someone set syntax-begin-function to #'beginning-of-defun, maybe they meant something by that.

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