The following code, when pasted into the shell, yields the error message "map invoke failed: JS Error: ReferenceError: qqqqqq is not defined nofile_b:1" even though the variable "qqqqqq" has the value "Clem" when the map function is run.

var m = function(qqqqqq) {
    return function() {
        emit("foo", qqqqqq);
    };
};

var r = function(k, v) { return {} };

db.tmp.save({});
db.tmp.mapReduce(
    m("Clem"), r, 
    { "out": "tmp" }
);