Transmuting between collections of different types can lead to undefined behavior due to differences in ABI, size, or alignment. This can result in
serious issues like out-of-bounds memory access.
Code examples
Noncompliant code example
let vec = vec![2_u16];
unsafe {
std::mem::transmute::<_, Vec<u32>>(vec); // Noncompliant: Different size, likely out-of-bounds memory access.
}
Compliant solution
let vec = vec![2_u16];
let vec_u32: Vec<u32> = vec.into_iter().map(u32::from).collect(); // Compliant: Iterates, maps, and collects the values safely.
