Manual: When building from the channel, link to the exact Git revision

lib/default.nix

@@ -22,6 +22,8 @@ let
 in
   { inherit trivial lists strings stringsWithDeps attrsets sources options
       properties modules types meta debug maintainers licenses platforms systems;
+    # Pull in some builtins not included elsewhere.
+    inherit (builtins) pathExists readFile;
   }
   # !!! don't include everything at top-level; perhaps only the most
   # commonly used functions.

lib/lists.nix

@@ -1,14 +1,14 @@
 # General list operations.
 let
+
   inherit (import ./trivial.nix) deepSeq;
 
   inc = builtins.add 1;
 
   dec = n: builtins.sub n 1;
 
-  inherit (builtins) elemAt;
 in rec {
-  inherit (builtins) head tail length isList add sub lessThan;
+  inherit (builtins) head tail length isList add sub lessThan elemAt;
 
 
   # Create a list consisting of a single element.  `singleton x' is