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: ptr_cast_constness.rs
    path of file: ./repos/rust-clippy/tests/ui
    
    the code of the file until where you have to start completion: //@aux-build:proc_macros.rs

#![warn(clippy::ptr_cast
    
fn _msrv_1_65() {
    let ptr: *const u32 = &42_u32;
    let mut_ptr: *mut u32 = &mut 42_u32;

    let _ = ptr as *mut u32;
    let _ = mut_ptr as *const u32;
}