Type param Void

The following fails to be compiled, but I would expect one of the lines of `ones` or `twos` is valid.

``` haxe
class Test{
static function main():Void {
var voids:Array = [null, null, null];
var ones = voids.map(function() return 1); //Void -> Void should be (Void) -> Unknown<0>
var twos = voids.map(function(v) return 2); //Arguments and variables of type Void are not allowed
}
}
```