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Mention array sugar in guide #17535

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Expand Up @@ -1507,6 +1507,7 @@ You can create an array with just square brackets:

```{rust}
let nums = [1i, 2i, 3i];
let nums = [1i, ..20]; // Shorthand for an array of 20 elements all initialized to 1
```

So what's the difference? An array has a fixed size, so you can't add or
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