Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.7)
// Compass (v1.0.1)
// ----

$list: 1 2 3 4 5 6 7 8 9;

debug {
  n2: nth($list, 2); // ok, makes sense
  n-2: nth($list, -2); // 2 from the end, ok.
  //n0: nth($list, 0); // This fails.
  
  // This is really annoying when you need to programatically
  // traverse lists in multiple directions.
  // Easy enough to work around but takes more code.
}

SassMeister-output.css

debug {
  n2: 2;
  n-2: 8;
}