index.js
function o(obj) {
        obj.source = {
          text: text(),
          line: line(),
          column: column()
        }
        return obj;
      }
function o(obj) {
        obj.source = {
          text: text(),
          line: line(),
          column: column()
        }
        return obj;
      }
/* annotate the given object with source info