* lisp/emacs-lisp/package.el (package-installed-p): Warn if not ready.

Fixes: debbugs:12721

2 files changed, 6 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 1150b68fe0f..bb19e10b9ae 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2012-10-25  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+        * emacs-lisp/package.el (package-installed-p): Warn if not ready
+        (bug#12721).
+
 2012-10-25  Glenn Morris  <rgm@gnu.org>
 
         * emacs-lisp/cl-macs.el (cl-progv): Doc fix.
diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
index 28d166271fb..303642b5bec 100644
--- a/lisp/emacs-lisp/package.el
+++ b/lisp/emacs-lisp/package.el
@@ -728,6 +728,7 @@ It will move point to somewhere in the headers."
 (defun package-installed-p (package &optional min-version)
   "Return true if PACKAGE, of MIN-VERSION or newer, is installed.
 MIN-VERSION should be a version list."
+  (unless package--initialized (error "package.el is not yet initialized!"))
   (let ((pkg-desc (assq package package-alist)))
     (if pkg-desc
         (version-list-<= min-version