I'm using mongo shell 4.0.0 against MongoDB 2.4.9 to run an aggregation pipeline but it fails with this error:

E QUERY    [js] TypeError: invalid assignment to const `res' :
DB.prototype._runAggregate@src/mongo/shell/db.js:250:19 

I had a look at the source code and it looks like res is being declared as a constant on line 242

const res = doAgg(cmdObj);

but is being reassigned on line 250.  The problem may be that the version of MongoDB I'm using is way older than the client but, in my limited knowledge of Javascript, a const cannot be reassigned

I can reproduce the error with this example query:

db.users.aggregate([{
    $match: {
        userId: 'a598fd6f-b947-44e7-9f60-8ecbbde136a7'
    }
}]);