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### What it does
Checks for usage of `Box<T>` where an unboxed `T` would
work fine.
### Why is this bad?
This is an unnecessary allocation, and bad for
performance. It is only necessary to allocate if you wish to move the box
into something.
### Example
```
fn foo(x: Box<u32>) {}
```
Use instead:
```
fn foo(x: u32) {}
```
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