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### What it does
Check for unnecessary `if let` usage in a for loop
where only the `Some` or `Ok` variant of the iterator element is used.
### Why is this bad?
It is verbose and can be simplified
by first calling the `flatten` method on the `Iterator`.
### Example
```
let x = vec![Some(1), Some(2), Some(3)];
for n in x {
if let Some(n) = n {
println!("{}", n);
}
}
```
Use instead:
```
let x = vec![Some(1), Some(2), Some(3)];
for n in x.into_iter().flatten() {
println!("{}", n);
}
```
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