Subset enums

Based on the syntax supported by pattern types (when they emerge) would my example be re-worked to be like: #[derive(Debug, Error)] pub enum MyError { #[error("not found")] NotFound, #[error("invalid state")] InvalidState, #[error("permission denied")] PermissionDenied, } pub enum MyErrorSubset { NotFound is MyError::NotFound, PermissionDenied is MyError::PermissionDenied, } This seems like making the parent a repr type and using as.