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### What it does
Checks for using `x.get(0)` instead of
`x.first()`.
### Why is this bad?
Using `x.first()` is easier to read and has the same
result.
### Example
```
let x = vec![2, 3, 5];
let first_element = x.get(0);
```
Use instead:
```
let x = vec![2, 3, 5];
let first_element = x.first();
```
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