Merge staging-next into staging

pkgs/stdenv/generic/default.nix

@@ -152,9 +152,12 @@ let
         inherit lib config stdenv;
       }) mkDerivation;
 
-      # For convenience, bring in the library functions in lib/ so
-      # packages don't have to do that themselves.
-      inherit lib;
+      # Slated for deprecation in 21.11
+      lib = builtins.trace
+        ( "Warning: `stdenv.lib` is deprecated and will be removed in the next release."
+         + " Please use `pkgs.lib` instead."
+         + " For more information see https://github.com/NixOS/nixpkgs/issues/108938")
+        lib;
 
       inherit fetchurlBoot;