~/src/vendor/coffee-script ∴ bin/coffee -ce '(x) => (y) => (z) -> (a) => this'
(function() {
  var _this = this;

  (function(x) {
    return function(y) {
      return function(z) {
        var _this = this;
        return function(a) {
          return _this;
        };
      };
    };
  });

}).call(this);