Set container pseudo-selector states

set-states.scss

@mixin set-states($states) {
  $selector: ();
  @for $i from 1 through length($states) {
    $selector: append($selector, unquote("&:#{nth($states, $i)}"), comma);
  }
  #{$selector} {
    @content;
  }
}

div {
  @include set-states('a' 'b' 'c') {
    color: purple;    
  }
}

/* output:
div:a, div:b, div:c {
  color: purple;
}
*/