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### What it does
Checks for `.to_digit(..).is_some()` on `char`s.
### Why is this bad?
This is a convoluted way of checking if a `char` is a digit. It's
more straight forward to use the dedicated `is_digit` method.
### Example
```
let is_digit = c.to_digit(radix).is_some();
```
can be written as:
```
let is_digit = c.is_digit(radix);
```
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