What is the reason for using different syntax for Move and TakePhoto from the Operation enum in the penultimate example? Is there a name for each of those enum member types?
enum Foo {
StructVariant { named: i32, fields: String, with: (), types: usize },
TupleVariant(i32, String, usize), // only types and position information
UnitVariant, // just a tag, no other days being carried
}