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### What it does
Checks for excessive
use of bools in structs.
### Why is this bad?
Excessive bools in a struct
is often a sign that it's used as a state machine,
which is much better implemented as an enum.
If it's not the case, excessive bools usually benefit
from refactoring into two-variant enums for better
readability and API.
### Example
```
struct S {
is_pending: bool,
is_processing: bool,
is_finished: bool,
}
```
Use instead:
```
enum S {
Pending,
Processing,
Finished,
}
```
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