digest-hud

function instrumentedWatch(watchExpression, listener, objectEquality) {
        // jshint validthis:true
        var watchTimingSet = false;
        if (!watchTiming) {
          // Capture watch timing (and its key) once, before we descend in $$watchDelegates.
          watchTiming = createTiming(formatExpression(watchExpression));
          watchTimingSet = true;
        }

        if (watchExpression && watchExpression.indexOf && watchExpression.indexOf('|') !== -1) {
          console.log('bingo');
        }

        originalWatch.call(this, watchExpression, listener, objectEquality);
        // try {
          // if (angular.isString(watchExpression)) {
          //   if (!$parse) {
          //     angular.injector(['ng']).invoke(['$parse', function(parse) {$parse = parse;}]);
          //   }
          //   watchExpression = $parse(watchExpression);
          // }
          // if (watchExpression && watchExpression.$$watchDelegate) {
          //   return originalWatch.call(this, watchExpression, listener, objectEquality);
          // } else {
          //   return originalWatch.call(
          //     this, wrapExpression(watchExpression, watchTiming, 'watch', true, false),
          //     wrapListener(listener, watchTiming), objectEquality);
          // }
        // } finally {
        //   if (watchTimingSet) watchTiming = null;
        // }
      }