Sass :: SyntaxError“无效的CSS”

Question

我在我的Rails应用程序（3.2.17）中运行此SASS代码：

@each $text, $foreground, $background in (submitted, white, grey),
                                        (partially_paid, white, orange),
                                        (paid, white, green),
                                        (accepted, white, blue),
                                        (declined, red, black),
                                        (waitinglist, black, grey),
                                        (lastminute, white, pink),
                                        (out, white, red),
                                        (blacklist, white, black) {
    .label-#{$text},
    .badge-#{$text} {
        background-color: #{$background} !important;
        color: #{$foreground};
    }
}

我尝试用Sassmeister验证它，它似乎工作 http://sassmeister.com/gist/7144802

但是Rails会抛出这样的错误：

Sass::SyntaxError - Invalid CSS after "@each $text": expected "in", was ", $foreground, ..."

我做错了什么？