Nested Enums? about serde-yaml HOT 3 CLOSED

use serde::{Serialize, Serializer};

#[derive(Serialize)]
#[serde(remote = "Self")]
pub enum ExprKind {
    ...
}

impl Serialize for ExprKind {
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        struct ExternallyTaggedExprKind<'a>(&'a ExprKind);
        impl<'a> Serialize for ExternallyTaggedExprKind<'a> {
            fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
                ExprKind::serialize(self.0, serializer)
            }
        }
        serde_yaml::with::singleton_map::serialize(&ExternallyTaggedExprKind(self), serializer)
    }
}