Redefining a let variable inside a for loop scope doesn't work?

[/#!/JoePea]

The following examples are very confusing, and throw an error that `n` is
undefined:

```js
function go(n){
  for (let n of n.a) {
    console.log(n);
  }
}

go({a:[1,2,3]});
```

```js
let n = {a:[1,2,3]}
for (let n of n.a) {
  console.log(n);
}
```

Why does the `let n` in the for loop not create a new variable inside the
for loop scope? This seems to go against the intuitive expectation of using
`let`, which is to make variable scoping more clear and less error-prone,
so it seems that one would expect the above examples to create a new
variable `n` inside the scope.

Why is this not the case? Is it by design, and if so why?


*/#!/*JoePea
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