Hi everyone,
I'm in the process of porting C to Rust and I'm reading:
https://medium.com/dwelo-r-d/wrapping-unsafe-c-libraries-in-rust-d75aeb283c65
One of the examples there:

use std::marker::PhantomData;pub struct Cipher<'a> {
    cipher: *const ffi::SSL_CIPHER,
    phantom: PhantomData<&'a OpenSSL>,
}fn from<'a>(_: &'a OpenSSL, cipher: *const ffi::SSL_CIPHER)
  -> Cipher<'a> {
    Cipher { cipher, phantom: PhantomData }
}

Does anyone knows the reasons why the above couldn't be just:

use std::marker::PhantomData;pub struct Cipher<'a> {
    cipher: 'a *const ffi::SSL_CIPHER,//lifetime declared here, where it really belongs
}
fn from<'a>(_: &'a OpenSSL, cipher: *const ffi::SSL_CIPHER)
  -> Cipher<'a> {
    Cipher { cipher, phantom: PhantomData }
}

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