by doesn't work with range loops/comprehensions

[aroben]

$ coffee -be --cli "console.log (n for n in [0..5] by 2)"
[ 0, 1, 2, 3, 4, 5 ]
$ coffee -bj --cli "console.log (n for n in [0..5] by 2)"
// Generated by CoffeeScript 2.0.0-beta9-dev
var n;
console.log(function (accum$) {
  for (i$ = 0; i$ <= 5; ++i$) {
    n = i$;
    accum$.push(n);
  }
  return accum$;
}.call(this, []));

jashkenas/coffee-script says:

$ coffee -be "console.log (n for n in [0..5] by 2)"
[ 0, 2, 4 ]
$ coffee -bce "console.log (n for n in [0..5] by 2)"
// Generated by CoffeeScript 1.7.1
var n;

console.log((function() {
  var _i, _results;
  _results = [];
  for (n = _i = 0; _i <= 5; n = _i += 2) {
    _results.push(n);
  }
  return _results;
})());

[michaelficarra]

CSR doesn't currently support stepped loops of any kind.