secrecy: How to construct SecretBox about crates HOT 7 OPEN

291 |   impl Zeroize for Box<[u8;3]> {
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `alloc::boxed::Box<[u8; 3]>`
    |
    = note: upstream crates may add a new impl of trait `core::marker::Copy` for type `alloc::boxed::Box<[u8; 3]>` in future versions

fn impls_zeroize<Z: Zeroize>(_: &Z) {}

#[cfg(feature = "alloc")]
#[test]
fn zeroize_box() {
      let mut boxed_arr = Box::new([42u8; 3]);
      // works
      <[u8; 3] as Zeroize>::zeroize(&mut *boxed_arr);
      // works
      boxed_arr.zeroize();
      // doesn't work
      <Box<[u8; 3]> as Zeroize>::zeroize(&mut boxed_arr);
      // doesn't work
      impls_zeroize(&boxed_arr);
      assert_eq!(boxed_arr.as_ref(), &[0u8; 3]);
 }

#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
impl Zeroize for Box<[u8; 3]>
{
    fn zeroize(&mut self) {
       (**self).zeroize()
  }
}

#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
impl<Z> Zeroize for Box<Z>
where
    Z: Zeroize,
{
    fn zeroize(&mut self) {
       (**self).zeroize()
  }
}

   Compiling zeroize v1.1.1 (/home/c/pjts/secretbox/src/vendor/zeroize)
error[E0119]: conflicting implementations of trait `Zeroize` for type `alloc::boxed::Box<_>`:
   --> src/lib.rs:375:1
    |
237 | / impl<Z> Zeroize for Z
238 | | where
239 | |     Z: DefaultIsZeroes,
240 | | {
...   |
244 | |     }
245 | | }
    | |_- first implementation here
...
375 | / impl<Z> Zeroize for Box<Z>
376 | | where
377 | |     Z: Zeroize,
378 | | {
...   |
385 | |     }
386 | | }
    | |_^ conflicting implementation for `alloc::boxed::Box<_>`
    |
    = note: downstream crates may implement trait `DefaultIsZeroes` for type `alloc::boxed::Box<_>`