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### What it does
Checks for implicit saturating subtraction.
### Why is this bad?
Simplicity and readability. Instead we can easily use an builtin function.
### Example
```
let mut i: u32 = end - start;
if i != 0 {
i -= 1;
}
```
Use instead:
```
let mut i: u32 = end - start;
i = i.saturating_sub(1);
```
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