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### What it does
Checks for usage of `option_env!(...).unwrap()` and
suggests usage of the `env!` macro.
### Why is this bad?
Unwrapping the result of `option_env!` will panic
at run-time if the environment variable doesn't exist, whereas `env!`
catches it at compile-time.
### Example
```
let _ = option_env!("HOME").unwrap();
```
Is better expressed as:
```
let _ = env!("HOME");
```
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