[bluejekyll]

What he is showing is how someone who knows Rust well, would potentially approach this problem.

What you're point out is that it's a large bar to ask a new comer to the language to do this because it requires a deeper understanding of the language to use.

Is it not appropriate to show that you can reduce the complexity of a program by using other features of the language?

It's not significantly different from reducing

   x + x + x + x

To

   4x