### What it does
Checks for nested `if` statements which can be collapsed
by `&&`-combining their conditions.
### Why is this bad?
Each `if`-statement adds one level of nesting, which
makes code look more complex than it really is.
### Example
```
if x {
if y {
// …
}
}
```
Use instead:
```
if x && y {
// …
}
```