Has future compat warnings over a year old, and given that it is unmaintained
there is very little possibility that these will be fixed.

warning: conflicting implementations of trait `Trait` for type `(dyn std::marker::Send + std::marker::Sync + 'static)`: (E0119)
   |
71 | unsafe impl Trait for ::std::marker::Send + Sync { }
   | ------------------------------------------------ first implementation here
72 | unsafe impl Trait for ::std::marker::Send + Send + Sync { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `(dyn std::marker::Send + std::marker::Sync + 'static)`
   |
   = note: `#[warn(order_dependent_trait_objects)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #56484 <https://github.com/rust-lang/rust/issues/56484>