From 69e4f1737276b9b66c6b921485f7a9b3cefe0a0f Mon Sep 17 00:00:00 2001
From: Michael Raskin <7c6f434c@mail.ru>
Date: Wed, 20 Aug 2008 04:34:28 +0000
Subject: [PATCH] Added null recognition to whatis

svn path=/nixpkgs/trunk/; revision=12663
---
 pkgs/lib/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/lib/default.nix b/pkgs/lib/default.nix
index 999efd38ecd7..a23b7d947efd 100644
--- a/pkgs/lib/default.nix
+++ b/pkgs/lib/default.nix
@@ -465,6 +465,7 @@ rec {
       else if (x == []) then "x is an empty list"
       else if (__isList x) then "x is a list, first item is : ${whatis (__head x)}"
       else if (x == true || x == false) then builtins.toString x
+      else if (x == null) then "x is null"
       else "x is probably a string starting, starting characters: ${__substring 0 50 x}..";