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: cast_abstract_args_to_concrete_fixme.rs
    path of file: ./repos/kani/tests/kani/Cast
    
    the code of the file until where you have to start completion: // Copyright Kani Contributors
// SPDX-License-Identifier: Apache-2.0 OR MIT

//! This test is a modified version of cast_abstract_args_to_concr
    
fn main() {
    let _x32 = 1.0f32.powi(2);
    let _x64 = 1.0f64.powi(2);

    unsafe {
        let size: libc::size_t = mem::size_of::<i32>();
        let my_num: *mut libc::c_void = libc::malloc(size);
        if my_num.is_null() {
            panic!("failed to allocate memory");
        }
        let my_num2 = libc::memset(my_num, 1, size);
        libc::free(my_num);
    }
}