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### What it does
Checks for `fn main() { .. }` in doctests
### Why is this bad?
The test can be shorter (and likely more readable)
if the `fn main()` is left implicit.
### Examples
```
/// An example of a doctest with a `main()` function
///
/// # Examples
///
/// ```
/// fn main() {
/// // this needs not be in an `fn`
/// }
/// ```
fn needless_main() {
unimplemented!();
}
```
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