$x: 3;

div {
	noo: not $x;
	poo: not 3;
	doo: not($x);
	goo: not(3);
	zoo: not 1 + 2;

	roo: not not not $x;
	hoo: not not not 3;
}

@mixin foo($x-1, $x-2) {
  goo: $x-1;
  poo: $x-2;
}
$hux: "blah.css";
span {
  a: rgba(100, 20, 0, 1);
  b: rgba(#abc, 1);
  c: compact(hello, my, false, name, is, false, aaron, false, false);
  d: join(1 2 3, 4 5 6, comma);
  e: join(a b c, d e f);
  f: change-color(#102030, $blue: 5);
  g: change-color(#102030, $red: 120, $blue: 5);
  h: hsl(25, 100%, 80%);
  h: change-color(#ffc499, $alpha: 0.8, $lightness: 40%);
  h: change-color(hsl(25, 100%, 80%), $alpha: 0.8, $lightness: 40%);
  i: hsla(25, 100%, 40%, 0.8);
  foo: url("http://blah/flah/grah");
  foo: url(http://foo/bar/buzz.css);
  foo: url(hey#{1+3}ho.css);
  foo: url($hux);
  bug: compact(false 1 2 false 3 4 5 false);
  pug: compact(false, 1, 2, false, 3, 4, 5, false);
  mug: compact((flug, false, blug, false, krug, false));
}

@mixin bg($file) {
  background: url($file) no-repeat;
}

div {
  flug: url(bug.mug);
  krug: nth(1 2 3, 2px);
  blug: nth(a b c d, 3);
  flig: comparable(34, 22px) comparable(1%, 3) comparable(2, 1) comparable(4cm, 1in);
  flug: comparable(1px, 2.3in) comparable(1%, 2pt);
  flib: comparable(3ex, 2px) comparable(3em, 2cm);
  glib: not(fudge) not(false) not(0) not(red + green);
  trib: if(red + green, yellow, not taken);
  trub: if(not(fudge), not taken, here we are);
}

$width: 10px;
$height: 10px;
@media (-webkit-min-device-pixel-ratio: 2), (-moz-min-device-pixel-ratio: 2) {
  div {
    background-image: url(fudge);
    -webkit-background-size: $width $height;
  }
}

span {
  @media foo {
    div {
      blah: blah;
    }
    @media bar {
      p {
        blah: bloo;
      }
    }
  }
}

gudge {
  fudge: 20 + "%";
  mudge: 1 + blang;
}

h1:lang(en) {
  foo: bar;
}