Revert "tryAttrs: init function"

This reverts commit 338340f993.

lib/attrsets.nix

@@ -438,24 +438,6 @@ rec {
   overrideExisting = old: new:
     old // listToAttrs (map (attr: nameValuePair attr (attrByPath [attr] old.${attr} new)) (attrNames old));
 
-  /* Try given attributes in order. If no attributes are found, return
-     attribute list itself.
-
-     Example:
-       tryAttrs ["a" "b"] { a = 1; b = 2; }
-       => 1
-       tryAttrs ["a" "b"] { c = 3; }
-       => { c = 3; }
-  */
-  tryAttrs = allAttrs: set:
-    let tryAttrs_ = attrs:
-      if attrs == [] then set
-      else
-        (let h = head attrs; in
-         if hasAttr h set then getAttr h set
-         else tryAttrs_ (tail attrs));
-    in tryAttrs_ allAttrs;
-
 
   /*** deprecated stuff ***/