Operator `<<` doesn't work for a string in a variable.

[Kray-G]

The following code doesn't work.

class Console {
    public <<(msg) {
        System.print(msg);
        return this;
    }
}

var v = "v";
var COUT = new Console();
COUT << "a\n";  // Good.
COUT << v << "\n"; // doesn't work.