docs: function associateComments(ast, sorted) {
    ast.comments
      .forEach(function eachComment(comment) {
  
        // decorate the comment with the node that follows it in the sorted node list
        var index     = sorted.indexOf(comment);
        var annotates = sorted[index + 1];
        if (annotates) {
          comment.annotates = annotates;
        }
  
        // comments generally can't be converted by source-map and won't be considered by sourcemap-to-ast
        delete comment.loc;
      });
  }