1<===> input.scss
2$flow: left;
3
4$map: (
5  margin-#{$flow}: 3em,
6  foo: bar,
7);
8
9.test {
10  margin-left: map-get($map, margin-left);
11}
12
13<===> output.css
14.test {
15  margin-left: 3em;
16}
17