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Cyril Auburtin (2018-04-05T08:29:46.000Z)

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I don't understand:

```js

var z=1; var fn = (z = z) => z; fn() // throws ReferenceError: z is not
defined
```
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cyril.auburtin at gmail.com (2018-04-05T08:31:30.971Z)

I don't understand:

```js

var z=1; var fn = (z = z) => z; fn() // throws ReferenceError: z is not defined
```

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