Comment by dataflow

> The code in the article is not wrong. It is not unsafe. The author explicitly handles the OOM case correctly.

And hence we circle back to what I just wrote above: you're confusing the code with the program that it compiles to. Because the code isn't there solely for the purpose of being compiled into a program, it's also serving as a stepping stone for other things (learning, modification, whatever). https://news.ycombinator.com/item?id=42733611

If it helps to phrase it differently: the code might be "compile-safe", but not "modification-safe" or "learning-safe".