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Now that we have our own Vec implementation, we can add some APIs which were previously impossible.
Vec::split_at can convert a Vec into 2 x Vecs, without copying any data or making any allocations.
let original_len = vec.len();
let original_capacity = vec.capacity();
let original_ptr = vec.as_ptr();
// `split_at` returns `None` if `vec.len() < 2`
let (vec1, vec2) = vec.split_at(2).unwrap();
assert!(vec1.len() == 2);
assert!(vec1.capacity() == 2);
assert!(vec2.len() == original_len - 2);
assert!(vec2.capacity() == original_capacity - 2);
// `vec1` and `vec2` point to chunks of the original `vec`
assert!(vec1.as_ptr() == original_ptr);
assert!(vec2.as_ptr() == original_ptr.add(2));This would be useful in various places in transformer where we currently have to allocate new Vecs and copy data around. e.g. oxc-project/oxc#10434 (comment)
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