src/tools/clippy/src/docs/zero_ptr.txt


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### What it does
Catch casts from `0` to some pointer type

### Why is this bad?
This generally means `null` and is better expressed as
{`std`, `core`}`::ptr::`{`null`, `null_mut`}.

### Example
```
let a = 0 as *const u32;
```

Use instead:
```
let a = std::ptr::null::<u32>();
```