After being stuck on exercise enums3.rs for about an hour or two, having read the entire chapter on enums 2-3 times, and still being unable to complete the exercise, i started broadening my reading. I finally found the answer in the rust docs via google.
Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.
BREAKING CHANGE: This fundamentally changes the way people interact with exercises.
Jens