impl of iter::base_iter<uint> for uint
{
   fn each(blk: fn(&&uint) -> bool)
   {
      let mut i = 0u;
      while i < self
      {
         if (!blk(i))
         {
            ret;
         }
         i += 1u;
      }
   }

   fn size_hint() -> option<uint>
   {
      option::some(self)
   }
}

let names = iter::map_to_vec(N) {|i: uint| #fmt["a%?", i]};