1<===> input.scss
2$foo\bar: 1;
3
4@function foo\func() { @return 1; }
5@mixin foo\mixin() { mixin-value: 1; }
6
7.test {
8    var-value: $foo\bar;
9    func-value: foo\func();
10    @include foo\mixin();
11}
12
13<===> output.css
14.test {
15  var-value: 1;
16  func-value: 1;
17  mixin-value: 1;
18}
19