CODE EXAMPLE FOR RUST

armanriazi•rust•unsafe•trait

Another use case for unsafe is implementing an unsafe trait. 
A trait is unsafe when at least one of its methods has some invariant that By using unsafe impl, we’re promising that we’ll uphold the invariants that the compiler can’t verify.
We can declare that a trait is unsafe by adding the unsafe keyword before trait and marking the implementation of the trait as unsafe too
{
Sync and Send are examples of unsafe traits.
}

unsafe trait Foo {
    // methods go here
}

unsafe impl Foo for i32 {
    // method implementations go here
}

fn main() {}