Coffeescript 1.6.1 bug

test.coffee

class Foo
  'bar:baz' : =>

new Foo

test.js

// Generated by CoffeeScript 1.6.1
(function() {
  var Foo,
    _this = this;

  Foo = (function() {

    function Foo() {
      var _this = this;
      this['bar:baz'] = function() {
        // seems like this should be:
        // return Foo.prototype['bar:baz'].apply(_this, arguments);
        return Foo.prototype.'bar:baz'.apply(_this, arguments);
      };
    }

    Foo.prototype['bar:baz'] = function() {};

    return Foo;

  })();

  new Foo;

}).call(this);