Generated by SassMeister.com.

SassMeister-input-HTML.html

<label>foo</label>
<label class="blue">foo</label>

SassMeister-input.scss

// ----
// Sass (v3.4.6)
// Compass (v1.0.1)
// ----

$sprite-names: 'foo.png', 'bar.png', 'baz.png';

@mixin retina-sprite($name, $sprite-name: 0, $hover: false, $active: false) {
  $retina-sprite-names: $sprite-names !global;
  $index: index($retina-sprite-names, $sprite-name);
  debug: $index;

//  $sprite       : nth($retina-sprite-sprites, $index);
//  $sprite-url   : nth($retina-sprite-urls, $index);

//  $sprite2x     : nth($retina-sprite-sprites2x, $index);
//  $sprite-url2x : nth($retina-sprite-urls2x, $index);

//  @include _retina-sprite($name, $sprite, $sprite-url, $sprite2x, $sprite-url2x, $hover, $active);
}

.foo {
  @include retina-sprite('foo', 'foo.png');
}

.bar {
  @include retina-sprite('bar', 'bar.png');
}

.baz {
  @include retina-sprite('baz', 'baz.png');
}

SassMeister-output.css

.foo {
  debug: 1;
}

.bar {
  debug: 2;
}

.baz {
  debug: 3;
}

SassMeister-rendered.html

<label>foo</label>
<label class="blue">foo</label>