If they do the same as with Rust 2018, the actual list of changes in the Rust Edition Guide will be much larger, because they will list all of the major non-bre

If they do the same as with Rust 2018, the actual list of changes in the Rust Edition Guide will be much larger, because they will list all of the major non-breaking changes since 2018 as part of 2021, even though most of them are available in all editions and have been ever since whatever version introduced them. The idea being that the editions guide documents "What is new since the day of release of the previous edition", in addition to documenting the changes specific to the new edition (which are generally breaking changes, or they would be made available to all editions). But still, the list of breaking changes here is quite small, and mostly some edge cases that will not impact the overwhelming majority of code.