### What it does
Checks for variable declarations immediately followed by a
conditional affectation.

### Why is this bad?
This is not idiomatic Rust.

### Example
```
let foo;

if bar() {
    foo = 42;
} else {
    foo = 0;
}

let mut baz = None;

if bar() {
    baz = Some(42);
}
```

should be written

```
let foo = if bar() {
    42
} else {
    0
};

let baz = if bar() {
    Some(42)
} else {
    None
};
```