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### What it does
Warns on any exported `enum`s that are not tagged `#[non_exhaustive]`
### Why is this bad?
Exhaustive enums are typically fine, but a project which does
not wish to make a stability commitment around exported enums may wish to
disable them by default.
### Example
```
enum Foo {
Bar,
Baz
}
```
Use instead:
```
#[non_exhaustive]
enum Foo {
Bar,
Baz
}
```
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