lib/parser.js
function(){
    if (this.accept('not')) {
      var node = new nodes.Expression;
      node.push(new nodes.Literal('not'));
      node.push(this.supportsFeature());
      return node;
    }
  }
function(){
    if (this.accept('not')) {
      var node = new nodes.Expression;
      node.push(new nodes.Literal('not'));
      node.push(this.supportsFeature());
      return node;
    }
  }
function ( ) { if ( this . accept ( 'not' ) ) { var node = new nodes . Expression ; node . push ( new nodes . Literal ( 'not' ) ) ; node . push ( this . supportsFeature ( ) ) ; return node ; } }
'not' supports feature
not supports feature