You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rand_impls.rs
    path of file: ./repos/incubator-teaclave-sgx-sdk/sgx_rand/src
    
    the code of the file until where you have to start completion: // Licensed to the Apache Software Foundation (ASF) under one

    
                fn rand<R: Rng>(rng: &mut R) -> Open01<$ty> {
                    // add a small amount (specifically 2 bits below
                    // the precision of f64/f32 at 1.0), so that small
                    // numbers are larger than 0, but large numbers
                    // aren't pushed to/above 1.
                    Open01(rng.$method_name() + 0.25 / SCALE)
                }