use rand_0_7::rngs::OsRng; use rand_core_0_6::{RngCore, CryptoRng}; use rand_compat::ForwardCompat;

// RngCore + CryptoRng from [email protected] fn something<R: RngCore + CryptoRng>(r: &mut R) -> u32 { r.next_u32() }

let mut rng = OsRng; // OsRng from [email protected] ([email protected])

let n = something(&mut rng.forward());

## Backward compatibility (using `rand/std` for `rand_0_8::OsRng`)

use rand_0_8::rngs::OsRng;
use rand_core_0_5::{RngCore, CryptoRng};
use rand_compat::BackwardCompat;

// RngCore + CryptoRng from [email protected]
fn something<R: RngCore + CryptoRng>(r: &mut R) -> u32 {
    r.next_u32()
}

let mut rng = OsRng;    // OsRng from [email protected] ([email protected])

let n = something(&mut rng.backward());