教程中的SASS示例确实有编译错误

Question

$list: adam john wynn mason kuroir

=author-images
  @each $author in $list
    .photo-#{$author}
      background: image-url("avatars/#{$author}.png") no-repeat;

.author-bio
  +author-images

有谁知道为什么来自http://thesassway.com/intermediate/if-for-each-while的代码示例未在SASSMeister中正确编译？

http://sassmeister.com/gist/b76fdc61130135864989