sass error math

[lucavalentino]

Utilizzoil framework Zurb Foundation.tramide Sass.

Quando vado ha compilare ricevo tale errore:
error scss/node_modules/foundation-sites/scss/util/_math.scss (Line 23: Invalid CSS after " @return math": expected "}", was ".abs($a);")

@use "sass:math";
////
/// @group functions
 
/// Finds the greatest common divisor of two integers.
///
/// @param {Number} $a - First number to compare.
/// @param {Number} $b - Second number to compare.
///
/// @returns {Number} The greatest common divisor.
@function gcd($a, $b) {
  // From: http://rosettacode.org/wiki/Greatest_common_divisor#JavaScript
  @if ($b != 0) {
    @return gcd($b, $a % $b);
  }
  @else {
    @return math.abs($a);  //LINE 23
    //@return math.abs(#{$a%});
  }
}