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### What it does
* Checks for [push](https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.push)
calls on `PathBuf` that can cause overwrites.
### Why is this bad?
Calling `push` with a root path at the start can overwrite the
previous defined path.
### Example
```
use std::path::PathBuf;
let mut x = PathBuf::from("/foo");
x.push("/bar");
assert_eq!(x, PathBuf::from("/bar"));
```
Could be written:
```
use std::path::PathBuf;
let mut x = PathBuf::from("/foo");
x.push("bar");
assert_eq!(x, PathBuf::from("/foo/bar"));
```
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