Improve error when installing non-package dirs

* lisp/emacs-lisp/package.el (package-dir-info): Throw meaningful error
when no file with package info is found (Bug #19851).

diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
index e721b553eaefde8b72847416afa1f7195d84e15c..f669c31e79146484a7dc2f356a8e5f334d178b0f 100644 (file)
--- a/lisp/emacs-lisp/package.el
+++ b/lisp/emacs-lisp/package.el
@@ -1081,6 +1081,8 @@ The return result is a `package-desc'."
               (setq files nil)
               ;; set the 'dir kind,
               (setf (package-desc-kind info) 'dir))))
+        (unless info
+          (error "No .el files with package headers in `%s'" default-directory))
         ;; and return the info.
         info))))