anchor.diff:  let lib = import ./default.nix;
  -    inherit (builtins) isFunction hasAttr getAttr head tail isList isAttrs attrNames;
  +    inherit (builtins) isFunction hasAttr getAttr head tail isList isAttrs isInt attrNames;
   
   in
   
  
positive.code:       ["flags" "cfg" "mergeAttrBy" ];
  
  
    # deep, strict equality testing. This should be implemented as primop
    eqStrict = a : b :
      let eqListStrict = a : b :
  
negative.code:       else if a == [] then true
        else eqStrict (head a) (head b) && eqListStrict (tail a) (tail b);
      in
      if nixType a != nixType b then false
        else if isList a then eqListStrict a b
          else if isAttrs a then
            (eqListStrict (attrNames a) (attrNames b))
            && (eqListStrict (lib.attrValues a) (lib.attrValues b))
          else a == b; # FIXME !
  }
  