gistfile1.rs

/* current API */
{
	let secret = Secret::new( /* bytes */ );

	secret.read(|slice| { println!("{}", slice) });
}

/* desired API */
{
	let secret = Secret::new( /* bytes */ );
	let slice  = secret.read(); // when slice goes out of scope, memory is re-protected

	println!("{}", slice);
}

/* especially awesome API */
{
	let slice;

	{
		let secret = Secret::new( /* bytes */ );
		slice      = secret.read();
	}

	/* compile error, since slice outlives the secret */
	println!("{}", slice);
}