看编译结果：http://SassMeister.com/gist/828587ab15a83f7d738d

utils.scss

@import 'base.sass/+';

// Specify supports
$browser-supports: parse-rules('last 5 versions');

.fn-clear {
  @include clearfix;
}

.fn-left {
  @include float(left, true);
}

.fn-right {
  @include float(right, true);
}


.fn-show {
  display: block !important;
}

.fn-hide {
  display: none !important;
}

.fn-invisible {
  visibility: hidden !important;
}

.fn-text-overflow {
  @include ellipsis-overflow;
}