Macro impl_non_serializable_protocol 

macro_rules! impl_non_serializable_protocol {
    ($type:ty, $msg:expr) => { ... };
}

Macro to implement error-returning Serialize/Deserialize for protocols that cannot be serialized (e.g., due to VM state or external SDK dependencies).

Examples

impl_non_serializable_protocol!(MyProtocolState, "error message");