<===> options.yml
---
:todo:
- libsass

<===> input.scss
div {
    foo: 'A'#{B};
    foo: #{A}'B';
    foo: 'A'#{B}'C';
    foo: #{A}'B'#{C};
    foo: A#{B}'C';
    foo: 'A'#{B}C;
    foo: #{A}B'C';
    foo: 'A'#{B}C'D';
    foo: 'A'B#{C}D'E';
    foo: A'B'#{C}D'E';
    foo: #{A}'B'C'D''E';
}

div {
    foo: type-of('A'#{B});
    foo: type-of(#{A}'B');
    foo: type-of('A'#{B}'C');
    foo: type-of(#{A}'B'#{C});
    foo: type-of(A#{B}'C');
    foo: type-of('A'#{B}C);
    foo: type-of(#{A}B'C');
    foo: type-of('A'#{B}C'D');
    foo: type-of('A'B#{C}D'E');
    foo: type-of(A'B'#{C}D'E');
    foo: type-of(#{A}'B'C'D''E');
}

div {
    foo: length('A'#{B});
    foo: length(#{A}'B');
    foo: length('A'#{B}'C');
    foo: length(#{A}'B'#{C});
    foo: length(A#{B}'C');
    foo: length('A'#{B}C);
    foo: length(#{A}B'C');
    foo: length('A'#{B}C'D');
    foo: length('A'B#{C}D'E');
    foo: length(A'B'#{C}D'E');
    foo: length(#{A}'B'C'D''E');
}
<===> output.css
div {
  foo: "A" B;
  foo: A "B";
  foo: "A" B "C";
  foo: A "B" C;
  foo: AB "C";
  foo: "A" BC;
  foo: AB "C";
  foo: "A" BC "D";
  foo: "A" BCD "E";
  foo: A "B" CD "E";
  foo: A "B" C "D" "E";
}

div {
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
  foo: list;
}

div {
  foo: 2;
  foo: 2;
  foo: 3;
  foo: 3;
  foo: 2;
  foo: 2;
  foo: 2;
  foo: 3;
  foo: 3;
  foo: 4;
  foo: 5;
}