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### What it does
Checks for `.err().expect()` calls on the `Result` type.
### Why is this bad?
`.expect_err()` can be called directly to avoid the extra type conversion from `err()`.
### Example
```
let x: Result<u32, &str> = Ok(10);
x.err().expect("Testing err().expect()");
```
Use instead:
```
let x: Result<u32, &str> = Ok(10);
x.expect_err("Testing expect_err");
```
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