output-1.5.0.js

// Generated by CoffeeScript 1.5.0
(function() {
  var Base, outsideMethod,
    __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

  outsideMethod = function(func) {
    return func.call({
      message: 'wrong!'
    });
  };

  Base = (function() {

    function Base() {
      this.echo = __bind(this.echo, this);      this.message = 'right!';
      outsideMethod(this.echo);
    }

    Base.prototype.echo = function() {
      return console.log(this.message);
    };

    return Base;

  })();

  new Base;

}).call(this);

output-1.6.1.js

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

  outsideMethod = function(func) {
    return func.call({
      message: 'wrong!'
    });
  };

  Base = (function() {

    function Base() {
      var _this = this;
      this.message = 'right!';
      outsideMethod(this.echo);
      this.echo = function() {
        return Base.prototype.echo.apply(_this, arguments);
      };
    }

    Base.prototype.echo = function() {
      return console.log(this.message);
    };

    return Base;

  })();

  new Base;

}).call(this);

source.coffee

outsideMethod = (func) ->
  func.call message: 'wrong!'

class Base
  constructor: ->
    @message = 'right!'
    outsideMethod @echo

  echo: =>
    console.log @message

new Base