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Showing content from https://github.com/rust-secure-code/safety-dance/issues/56 below:

Dependency of qbsdiff by the same author.

Noticed 2 patterns:

std::ptr::copy_nonoverlapping(&src_slice[i] as *const T, &mut dst_slice[j] as *mut T, n)
All non-UB uses can be replaced with dst.slice[j..j+n].copy_from_slice(src_slice[i..i+n]).
std::ptr::copy(&s[i] as *const T, &mut s[j] as *mut T, n)
Same idea, non-UB uses can be replaced with s.copy_within(i..i+n, j).
If the ranges are non-overlapping, it might be faster to use slice::split_at_mut and copy_from_slice (resulting in a call to std::ptr::copy_nonoverlapping)

Should we request a clippy lint?

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