From 4278f778b4bbbfe7862a74ae021bc84a68388d2a Mon Sep 17 00:00:00 2001
From: Rob Vermaas <rob.vermaas@gmail.com>
Date: Fri, 28 Jun 2013 21:34:33 +0200
Subject: [PATCH] Improve error message for option that is not defined and has
 now default value.

---
 pkgs/lib/modules.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/lib/modules.nix b/pkgs/lib/modules.nix
index ea38010cecc..9dda89b09f0 100644
--- a/pkgs/lib/modules.nix
+++ b/pkgs/lib/modules.nix
@@ -309,7 +309,7 @@ rec {
               let opt = option.decl; in
               opt.apply (
                 if isNotDefined then
-                  opt.default or (throw "Not defined.")
+                  opt.default or (throw "Option `${addName name}' not defined and does not have a default value.")
                 else opt.merge defs
               )
             );