Ich versuche, sass mixin für die Erzeugung langer Textschatten umzuschreiben
http://codepen.io/awesomephant/pen/mAxHz
zu wenig mixin

.long-shadow(@type, @color, @length, @fadeout: true, @skew: false, @direction: right){


 @shadow : '';
  .if @skew == false or @type == text{
    .if @direction == right {@
      @for @i from 0 to @length - 1 {
        @shadow: @shadow + @i + 'px ' + @i + 'px 0 ' + @color + ',';
      }
    }
    .if @direction == left {@
      @for @i from 0 to @length - 1 {
        @shadow: @shadow + @i * -1 + 'px ' + @i + 'px 0 ' + @color + ',';
       }
      }
     }

   .if @fadeout == true{
    @for @i from 1 to @length - 1 {
      .if @type == text or @skew == false{
        .if @direction == right{
          @shadow: @shadow + @i + 'px ' + @i + 'px 0 ' +       rgba(@color, 1 - @i / @length) + ',';
        }
        .if @direction == left{
          @shadow: @shadow + @i * -1 + 'px ' + @i + 'px 0 ' +       rgba(@color, 1 - @i / @length) + ',';
        }
      }
      .if (@type == box) and @skew == true{
        .if @direction == right {
          @shadow: @shadow + @i + 'px ' + @i + 'px 0 ' + @i * .2 + 'px ' + rgba(@color, 1 - @i / @length) + ',';
        }
        .if @direction == left {
          @shadow: @shadow + @i * -1 + 'px ' + @i + 'px 0 ' + @i * .2 + 'px ' + rgba(@color, 1 - @i / @length) + ',';
        }
      }
  }
  @shadow: @shadow + @length + 'px ' + @length + 'px 0 ' + rgba(@color, 0);
 }
 .if @fadeout == false{
   .if @skew == true and ( @type == box ){
     @for @i from 0 to @length - 1 {
            @shadow: @shadow + @i + 'px ' + @i + 'px 0 ' + @i * .1 + 'px ' + @color + ',';
      }
   }
    @shadow: @shadow + @length + 'px ' + @length + 'px 0 ' + rgba(0,0,0,0);
 }
 @shadow: unquote(@shadow);
  .if @type == 'box' {box-shadow: @shadow;}
  .if @type == 'text' {text-shadow: @shadow;}
} 

aber es geht nicht.
Ich bekomme schon in der ersten Zeile einen Fehler

ParseError: Unrecognised input
in style.less on line 2255, column 13:

2254
2255.long-shadow(@type, @color, @length, @fadeout: 'true', @skew: 'false', @direction: 'right'){
2256  @shadow : ''; 

Kann mir bitte jemand dabei helfen?