lib: attrs: add 'merge'

lib/attrs.nix

@@ -26,6 +26,13 @@ in
   #   attrs
   genAttrs' = values: f: listToAttrs (map f values);
 
+  # Merge a list of attrs non-recursively, later values override previous ones.
+  #
+  # merge ::
+  #   [ attrs ]
+  #   attrs
+  merge = foldl (a: b: a // b) { };
+
   # Merge a list of attrs recursively, later values override previous ones.
   #
   # recursiveMerge ::