bug#20852: 24.3; update-file-autoloads doesn't accept unescaped parenthesis character literal

[Philipp Stephani <p.stephani2@gmail.com>]

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Stefan Monnier <monnier@iro.umontreal.ca> schrieb am Mo., 22. Juni 2015 um
03:18 Uhr:

> > If this is generally unsupported, can we then remove it from the doc and
>
> Yes.  Do you happen to know where it's documented?
>

https://www.gnu.org/software/emacs/manual/html_node/elisp/Basic-Char-Syntax.html

"You can use the same syntax for punctuation characters, but it is often a
good idea to add a ‘\’ so that the Emacs commands for editing Lisp code
don’t get confused. For example, ‘?\(’ is the way to write the open-paren
character. If the character is ‘\’, you must use a second ‘\’ to quote it:
‘?\\’."

Here I would put ( and ) into the same category as \, so that it's not only
"a good idea" to escape it.

"However, you should add a backslash before any of the characters
‘()\|;'`"#.,’ to avoid confusing the Emacs commands for editing Lisp code."

Here I would make escaping mandatory for the first three characters (or
even for all of them).


>
> > have the reader print a warning (or reject it altogether)?
>
> We can't reject it, because I'm pretty sure there's code out there which
> uses it.  I'd accept a patch which adds a warning for it,
>
>
>
OK, I'll try to come up with a patch.

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