title: In Stylus, do I have to write nested selector from its root when @extend?
body: <p>Stylus returns 'Failed to @extend ".selector2" ', but it's OK in SASS.</p>
  
  <pre><code>.selector1
      color #000
      .selector2
          color #FFF
      .selector3
          @extend .selector2
  </code></pre>
  
  <p>It's OK when I write selectors from root in Stylus.</p>
  
  <pre><code>.selector1
      color #000
      .selector2
          color #FFF
      .selector3
          @extend .selector1 .selector2
  </code></pre>
  
  <p>But it's quite troublesome.</p>
  
  <p>Is there any way to write Stylus same as SASS?</p>