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Mention that overlay priority doesn't have to be nil or an integer.

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Fixes: debbugs:17234
This commit is contained in:
Eli Zaretskii 2014-04-21 16:46:25 +03:00
parent e3188b2df1
commit 819ed0f526
1 changed files with 9 additions and 0 deletions
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9
etc/NEWS
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@ -1218,6 +1218,15 @@ in the presence of files with negative time stamps.
** The cars of the elements in `interpreter-mode-alist' are now
treated as regexps rather than literal strings.
---
** Overlay priority does not have to be nil or a non-negative integer.
Overlay priority can be other kinds of Lisp objects. We didn't yet
decide whether other types of values are stable enough, and therefore
don't feel it's right to document them. For now, don't assume in your
code that the values of overlay priority can only be either nil or an
integer, always test them with an appropriate predicate to be one or
the other.
* Lisp Changes in Emacs 24.4