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In a few instances, the text of the book correctly notes that a provided code example will not compile. However, the corresponding code example lacks a Ferris with a question mark. For example, Ch17.3 notes that Listing 17-11 "won’t compile yet because we haven’t implemented the blog crate yet" but Listing 17-11 does not have a Ferris (or a red background). Would a PR noting these discrepancies be helpful (or, alternatively, have I misunderstood something and it is appropriate for these code samples to lack a confused Ferris)?
In fact, there are similar problems in chapters 05, 12, and 20 as per #1505's 1st unresolved question. The appropriate code blocks were not annotated because of the resolution in #1505 (comment) by @steveklabnik, which was:
So it is questionable whether this needs to be done. In case the decision is to show Ferris on those as well, the appropriate code blocks can be marked; one can see the different attributes used for this by opening