use ManuallyDrop instead of mem-forget-in-disguise

Author: RalfJung

src/bytes.rs

@@ -1,6 +1,7 @@
 use core::iter::FromIterator;
 use core::ops::{Deref, RangeBounds};
 use core::{cmp, fmt, hash, mem, ptr, slice, usize};
+use core::mem::ManuallyDrop;
 
 use alloc::{borrow::Borrow, boxed::Box, string::String, vec::Vec};
 
@@ -804,10 +805,9 @@ impl From<Vec<u8>> for Bytes {
             return Bytes::new();
         }
 
-        let slice = vec.into_boxed_slice();
+        let slice = ManuallyDrop::new(vec.into_boxed_slice());
         let len = slice.len();
         let ptr = slice.as_ptr();
-        drop(Box::into_raw(slice));
 
         if ptr as usize & 0x1 == 0 {
             let data = ptr as usize | KIND_VEC;