Ch. 18: use “dyn compatibility” instead of “object safety” #4129
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- Introduce the concept at the end of 18.2 when discussing the tradeoffs of dynamic dispatch, with a link to the reference. The link is not currently valid, because of the versioning timeline, but it will be when this stabilizes! - In 18.3, simply replace “object safe” with “dyn compatible”. There is still probably not enough discussion of it, but with the introduction and link in 18.2, it is *probably* enough for now?
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This is not technically part of the 2024 Edition but that’s when it will land in Rust and so it will be good to have this in place.
Fixes #3949 (kind of, anyway).