make method return String to be &'static str

[baoyachi]

#[repr(C)]
pub union PtrToRef<'a, T: ?Sized> {
    pub ptr: *const T,
    pub reff: &'a T,
}

fn main() {
    let hello = b"Hello union Rust";
    let key = unsafe {
        let string: &'static str = {
            PtrToRef {
                ptr: hello as *const [u8] as *const str,
            }.reff
        };
        string
    };
    println!("{}", key);
}

[baoyachi]

Reference link: https://github.com/orf/gping/blob/af82c7e29ce34ce96107db2b6dfce7134f8f19c9/gping/src/main.rs#L37-L47

[baoyachi]

use const_format crate solve