impl Serialize and Deserialize for ManuallyDrop

[DrSensor]

Hi, any plan to implement Serialize and Deserialize for ManuallyDrop? I happen to bump into a case when I need the compiler to not automatically drop on a certain function.

#[derive(Default, Serialize, Deserialize)]
pub struct Machine<'a> {
    #[serde(flatten)]
    schema: StateChart, // it should be 👇
    // schema: mem::ManuallyDrop<StateChart>,

    #[serde(skip)]
    builder: Scdlang<'a>,
}

impl<'a> Parser<'a> for Machine<'a> {
    fn parse(&mut self, source: &str) -> Result<(), DynError> {
        let ast = Self::try_parse(source, self.builder.to_owned())?;
        self.schema.states = ast.schema.states.to_owned(); //⚠ expensive clone
        // self.schema.states = ast.schema.states; //👈 with ManuallyDrop
        Ok(()
    }
}

impl Drop for Machine<'_> {
    fn drop(&mut self) {
        self.clear_cache().expect("Deadlock");
    }
}

[dtolnay]

I would accept a PR to add the impls.

[DrSensor]

@dtolnay, could you give a guide where it should be implemented?