bug#49944: parse-partial-sexp fails to signal an error when (> START LIMIT).

[Lars Ingebrigtsen]

Alan Mackenzie <acm@muc.de> writes:

> On calling
>
>     (parse-partial-sexp 19 18 nil nil s)

(What's `s' here?)

> Emacs surely ought to signal an error, since 18 < 19.

It's common for Emacs functions that take a region to not care about
whether to is larger than from or not.  The

  validate_region (&from, &to);

function fixes it up.

> It doesn't,
> though.  It leaves point at a random position and returns
>
>     (0 nil nil nil nil nil 0 nil nil nil nil)

For me it leaves point at 19.

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