Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.11)
// Compass (v1.0.3)
// ----

@import "compass/css3";

@function remove($list, $value, $recursive: false) {
  $result: ();

  @for $i from 1 through length($list) {
    @if type-of(nth($list, $i)) == list and $recursive {
      $result: append($result, remove(nth($list, $i), $value, $recursive));
    }

    @else if nth($list, $i) != $value {
      $result: append($result, nth($list, $i));
    }
  }

  @return $result;
}

@function join($list, $glue: "", $trim: true, $is-nested: false) {
  $result: null;

  @if $trim {
    $list: remove($list, "", true);
    $list: remove($list, null, true);
  }

  @for $i from 1 through length($list) {
    $e: nth($list, $i);

    @if type-of($e) == list {
      $result: $result#{join($e, $glue, $trim true)};
    }

    @else {
      $result: if($i != length($list) or $is-nested, $result#{$e}#{$glue}, $result#{$e});
    }
  }

  @return $result;
}

.test {
  @include transition(opacity .25s ease);
}

SassMeister-output.css

List index is 1 but list has no items for `nth'