I don't feel that it's in more poor form than the solution suggested in the article:

    for i := 0; i < 3; i++ {
      defer func(i int) {
       fmt.Println(i)
      }(i)
    }

This shadows `i` pretty much the same amount as what I wrote. If `i` gets a different name inside the lambda, then it'd also be worse because then you could accidentally use `i` still.