Generated by SassMeister.com.

SassMeister-input.scss

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

$colors: (
  _0: rgb(48,61,69),
  _1: rgb(210,158,105),
  _2: rgb(93,188,174),
  _3: rgb(242,101,51),
  _4: rgb(242,69,51),
  _5: rgb(245,69,69),
  _6: rgb(246,140,6),
  _7: rgb(0,174,219)
);

$complementaryColors: ();

@for $i from 8 through 15 {
  $pos: $i;
  $newPos: $pos - 8;
  $newMap: (_#{$i}: complement(map_get($colors, _#{$newPos})));
  map_merge($complementaryColors, $newMap);
}

SassMeister-output.css

Invalid CSS after "...olors, $newMap)": expected "{", was ";"