anchor.diff:          echo "ok" >&2
           exit 0
         fi
  -
  -      set -e
       '';
   
     };
  
positive.code:   config = {
  
      system.activationScripts.checks.text = ''
        set +e
  
        ${darwinChanges}
        ${buildUsers}
        ${nixPath}
  
negative.code: let
    darwinChanges = ''
      if test -e /run/current-system/darwin-changes; then
        darwinChanges=$(grep -v -f /run/current-system/darwin-changes $systemConfig/darwin-changes 2> /dev/null) || true
        if test -n "$darwinChanges"; then
          echo >&2
          echo "[1;1mCHANGELOG[0m" >&2
  