Macro dyn_newtype_impl_dyn_clone_passthrough

macro_rules! dyn_newtype_impl_dyn_clone_passthrough {
    ($name:ident) => { ... };
}

Implement Clone on a “dyn newtype”

… by calling clone method on the underlying dyn Trait.

Cloning dyn Traits is non trivial due to object-safety.

Note: the underlying dyn Trait needs to implement a fn clone(&self) -> Newtype for this to work, and this macro does not check or do anything about it.

If the newtype is using Arc you probably want to just use standard #[derive(Clone)] to clone the Arc itself.