diff --git a/lib/attrsets.nix b/lib/attrsets.nix
index d81d69b14025..20be2002402c 100644
--- a/lib/attrsets.nix
+++ b/lib/attrsets.nix
@@ -6,7 +6,6 @@ with {
   inherit (import ./default.nix) fold;
   inherit (import ./strings.nix) concatStringsSep;
   inherit (import ./lists.nix) concatMap concatLists all deepSeqList;
-  inherit (import ./misc.nix) maybeAttr;
 };
 
 rec {
@@ -86,7 +85,7 @@ rec {
   foldAttrs = op: nul: list_of_attrs:
     fold (n: a:
         fold (name: o:
-          o // (listToAttrs [{inherit name; value = op n.${name} (maybeAttr name nul a); }])
+          o // (listToAttrs [{inherit name; value = op n.${name} (a.${name} or nul); }])
         ) a (attrNames n)
     ) {} list_of_attrs;
 
diff --git a/lib/default.nix b/lib/default.nix
index 4b6027c437be..cd0d8161c8cb 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -11,7 +11,7 @@ let
   types = import ./types.nix;
   meta = import ./meta.nix;
   debug = import ./debug.nix;
-  misc = import ./misc.nix;
+  misc = import ./deprecated.nix;
   maintainers = import ./maintainers.nix;
   platforms = import ./platforms.nix;
   systems = import ./systems.nix;
diff --git a/lib/misc.nix b/lib/deprecated.nix
similarity index 99%
rename from lib/misc.nix
rename to lib/deprecated.nix
index fd20ce25010c..54c253f2c34b 100644
--- a/lib/misc.nix
+++ b/lib/deprecated.nix
@@ -203,8 +203,6 @@ rec {
     in
       work startSet [] [];
 
-  genericClosure = builtins.genericClosure or lazyGenericClosure;
-
   innerModifySumArgs = f: x: a: b: if b == null then (f a b) // x else 
         innerModifySumArgs f x (a // b);
   modifySumArgs = f: x: innerModifySumArgs f x {};
diff --git a/lib/options.nix b/lib/options.nix
index 6e8e9ce00061..5c543f56bcf3 100644
--- a/lib/options.nix
+++ b/lib/options.nix
@@ -4,7 +4,6 @@ let lib = import ./default.nix; in
 
 with import ./trivial.nix;
 with import ./lists.nix;
-with import ./misc.nix;
 with import ./attrsets.nix;
 with import ./strings.nix;
 
diff --git a/lib/strings.nix b/lib/strings.nix
index f0ecb15ab2d3..895b230744f9 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -210,6 +210,7 @@ rec {
   # standard GNU Autoconf scripts.
   enableFeature = enable: feat: "--${if enable then "enable" else "disable"}-${feat}";
 
+
   # Create a fixed width string with additional prefix to match required width
   fixedWidthString = width: filler: str:
     let
@@ -219,6 +220,7 @@ rec {
       assert strw <= width;
       if strw == width then str else filler + fixedWidthString reqWidth filler str;
 
+
   # Format a number adding leading zeroes up to fixed width
   fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);
 }
diff --git a/lib/trivial.nix b/lib/trivial.nix
index 8addde1b86cd..9fd5a7e1c57c 100644
--- a/lib/trivial.nix
+++ b/lib/trivial.nix
@@ -22,7 +22,7 @@ rec {
   inherit (builtins)
     pathExists readFile isBool isFunction
     isInt add sub lessThan
-    seq deepSeq;
+    seq deepSeq genericClosure;
 
   # Return the Nixpkgs version number.
   nixpkgsVersion =