Test that derived code works with std::mem::transmute

[turalcar]

The main offender is download_more_ram() that converts 0 to a pointer.

cve-rs/src/lib.rs

Line 105 in ab0d48f

let sentinel_slice = crate::transmute::<_, &[u8]>([0usize, 1usize]);

With std::mem::transmute this causes time-travelling UB: compiler concludes that the only way we could get 0 here is by failing unwrap() few lines prior. The simple solution would be to use 1usize and 2usize to deduce the slice pointer layout or just assume that the pointer goes first - it's not the end of the world.
This prevents removing #[inline(never)] in the implementation of transmute().