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### What it does
checks for `Box::new(T::default())`, which is better written as
`Box::<T>::default()`.
### Why is this bad?
First, it's more complex, involving two calls instead of one.
Second, `Box::default()` can be faster
[in certain cases](https://nnethercote.github.io/perf-book/standard-library-types.html#box).
### Example
```
let x: Box<String> = Box::new(Default::default());
```
Use instead:
```
let x: Box<String> = Box::default();
```
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