Bugs are UB-like in a sense (what's the code going to do? well, you'll have to think about it, or try it and see), but UB is strictly worse than bugs (different

Bugs are UB-like in a sense (what's the code going to do? well, you'll have to think about it, or try it and see), but UB is strictly worse than bugs (different compilers, even different versions of the same compiler, can do radically different things way beyond the scope of the bug).