@function test($in...) {
	@return $in;
}

fn {
	three: test(1,2,3);

	$foo: 1, 2, 3, 4;
	four: test($foo...);
}

@mixin box-shadow($shadows...) {
	box-shadow: $shadows;
}

box {
	$shadows: 0 0 0 #000, inset 5px 30px 10px red;
	@include box-shadow($shadows...);
}