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SassMeister-input.scss

// ----
// libsass (v0.7.0)
// ----

@mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
  background-image: url(if($bootstrap-sass-asset-helper, twbs-image-path("#{$file-1x}"), "#{$file-1x}"));

  @media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) {
    background-image: url(if($bootstrap-sass-asset-helper, twbs-image-path("#{$file-2x}"), "#{$file-2x}"));
    background-size: $width-1x $height-1x;
  }
}

SassMeister-output.css

source string:2: error: non-terminal statement or declaration must end with ';'