constptr 0.3.1

NonNull without mutability
Documentation 
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use constptr::ConstPtr;

#[test]
fn const_context() {
    let example = "const string";

    let _constptr = unsafe { ConstPtr::new_unchecked(example) };
}

#[test]
fn from_mut() {
    let mut example = 1234;

    #[allow(clippy::unnecessary_mut_passed)]
    let _constptr = ConstPtr::from(&mut example);
}