.named-colors-in-expressions {
color-0: 0 -red;
color-1: 1 - red;
color-2: red * 2;
color-3: 2 * red;
@3: -red;
&-bar@{3} {x: y}
@color: red;
&-bar@{color} {a: a};
background-color: blue-2;
color: green-black;
animation: blue-change 5s infinite;
}