gistfile1.txt

// less
foo, bar {                                                                                  
   color: black;    
 
   lol, &:cat {    
      font: none;    

      > a, b {    
           color: red;                             
      }                                      
   }    
}    

// css (generated with less.js)

foo, bar {
  color: black;
}
foo lol,
bar lol,
foo:cat,
bar:cat {
  font: none;
}
foo lol > a,
bar lol > a,
foo:cat > a,
bar:cat > a,
foo lol b,
bar lol b,
foo:cat b,
bar:cat b {
  color: red;
}