pub const RUN_CLASSES: &[&str];Expand description
Every class fallback_class can return, plus the run itself.
ROW_PART_CLASSES’s reasoning and the same
obligation: a match over a #[non_exhaustive] enum cannot be enumerated
from outside, so the list sits beside it and a test holds the two together.
run is in it because it is emitted in its own right rather than only as a
fallback’s fallback.