Sometimes, when we do operations with integers, we do not take overflows, underflows, and wrappings into account. C will let you do this by default, while Rust will panic when running in debug mode. In release mode, though, these integer overflows can be a big problem.

You can use the integer_arithmetic lint that will suggest using one of the wrapping_...() or saturating_...() methods of the integer to make sure you know what the outcomes of the operation are.