Comment by cowlevel

More abstract code probably results in more high-abstraction-level bugs per LoC, but also less low-abstraction-level bugs so I'd guess it about cancels out to an even rate per LoC.

A single line in C++, Rust or Haskell can have a really subtle logic error. A single line in assembly can't, but it has that same likelihood of having a register allocation error instead, and when you add up all the many lines of assembly you probably still wrote the same number of logic errors as the C++ version.