title: Parse a string as a map in SASS
body: <p>I have a few variables in SASS:</p>
  
  <pre><code>$tablet: 'max-width 48em';
  $desktop: 'max-width 62em';
  </code></pre>
  
  <p>I want the variables to be treated as a single entity as I'm iterating on them. However they then need to be passed into another mixin as a map.</p>
  
  <pre><code>@mixin rwd( $classes: (), $breakpoints: () ) {
    @content;
    @for $i from 1 through length($classes) {
      $breakpoint: unquote( nth($breakpoints, $i) );
      &amp;---#{nth($classes, $i)} {
        @include media( $breakpoint ) {
          @content;
        }
      } 
    }
  }
  </code></pre>
  
  <p>Called with <code>@include rwd( upto-desktop, $upto-desktop ) { }</code></p>
  
  <p>The issue is that when I use <a href="http://sass-lang.com/documentation/Sass/Script/Functions.html#unquote-instance_method" rel="nofollow">unquote</a> in SASS, the result is not treated as a map.</p>
  
  <p>Is there a SASS function I can call to parse the result as a map?
  Or any alternatives?</p>