Generated by SassMeister.com.

SassMeister-input.scss

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

@mixin media( $width ) {
	@if variable-exists( mq-list ){} @else {
    $mq-list:() !global;
  }
  @if map-has-key( $mq-list, $width ) {} @else {
    $mq-list: append( $mq-list, ( $width ) ) !global;
  }
  $selector: selector-parse(&) !global;
  $content: @content; // doesn't work
  $mq-list: map-merge( map-get( $mq-list, $width), ( $selector: $content )) !global;
}

@mixin media-group( $width ) {
  @each $selector, $content in map-get( $mq-list, $width ) {
    #{$selector} {
      $content;
    }
  }
}

.b {
  .a & .c {
    @include media( 660px ){
      background: red;
    }
  }
}

@include media-group( 660px );

SassMeister-output.css

Invalid CSS after "  $content: ": expected expression (e.g. 1px, bold), was "@content; // do..."