Extraneous '&' in .list-group-item rule

Created by: tonicboy

In list-group.less, there is an extra ampersand after the a selector on Line 44. The general structure is:

.list-group-item {
    ...
    a& {
        &:hover,
        &:focus {
          text-decoration: none;
          background-color: @list-group-hover-bg;
        }
    }
}

This doesn't break compilation but gives an unexpected result. Instead of creating a rule .list-group-item a:hover {} as I assume was meant, it creates a rule a.list-group-item:hover {}