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### What it does
Prevents the safe `std::mem::drop` function from being called on `std::mem::ManuallyDrop`.
### Why is this bad?
The safe `drop` function does not drop the inner value of a `ManuallyDrop`.
### Known problems
Does not catch cases if the user binds `std::mem::drop`
to a different name and calls it that way.
### Example
```
struct S;
drop(std::mem::ManuallyDrop::new(S));
```
Use instead:
```
struct S;
unsafe {
std::mem::ManuallyDrop::drop(&mut std::mem::ManuallyDrop::new(S));
}
```
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