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extern crate serde; use serde::ser::{Serialize, Serializer}; use serde::de::{Deserialize, Deserializer, Error as DeserializeError, Unexpected}; #[derive(Debug, PartialEq)] pub enum EventType { Input, Output, } impl Serialize for EventType { fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, { match *self { EventType::Input => serializer.serialize_char('i'), EventType::Output => serializer.serialize_char('o'), } } } impl<'de> Deserialize<'de> for EventType { fn deserialize<D>(deserializer: D) -> Result<EventType, D::Error> where D: Deserializer<'de>, { match <char>::deserialize(deserializer) { Ok('i') => Ok(EventType::Input), Ok('o') => Ok(EventType::Output), Ok(x) => Err(DeserializeError::invalid_value( Unexpected::Char(x), &"an 'i' or 'o'", )), Err(x) => Err(x), } } }