The ? Operator Can be used in functions that return Option (not just Result)

[ultrasaurus]

? can be used for Option or Result since 1.22 (see blog post)

Documentation in the book says "The ? Operator Can Only Be Used in Functions That Return Result" -- see https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html#recoverable-errors-with-result

the text of this section doesn't match the current capabilities of Rust, or but the displayed error message is correct (maybe the example errors are auto-generated):

[LeSeulArtichaut]

This has been adressed in #2047, I guess?

[ultrasaurus]

Looks good to me!