Chapter 4.1 Question 3

[simgar]

• I have searched open and closed issues and pull requests for duplicates, using these search terms:
  • 4.1
  • compiler
  • optimisation
• I have checked the latest main branch to see if this has already been fixed, in this file:
  • ch04-01-ownership-sec2-moves.toml

URL to the section(s) of the book with this problem:

https://github.com/cognitive-engineering-lab/rust-book/blob/main/quizzes/ch04-01-ownership-sec2-moves.toml

Description of the problem:

At this point the book, you haven’t dealt with compiler optimisations. Any experienced person could expect this code to be optimised out. You use a wrong answer as a teachable moment - that’s not good teaching if you haven’t already taught the subject.

This is the most complicated subject in Rust, it seems to me from what I read around the subject - I’ve already read the print book (2021) chapter once and I’m on my second* go around the interactive version - I don’t need a trick question at this point.

• I got to the end of chapter 8, before the second ownership inventory, and was still making ownership mistakes, so I went back to chapter 4.

Suggested fix:

Use a random number generator or ask the user for input.

Note:
Overall, I like the new permissions-based approach in the interactive version - I’ve found it really helpful, having already read the print version. But even having read both, I was still only getting about 50% of the questions. The ones that ask what the Rust doesn’t do have been particularly troublesome, e.g. question 4 in this block.