Add the derive proc macro

simconnect-sdk/src/errors.rs

@@ -1,15 +1,24 @@
 use thiserror::Error;
 
+/// SimConnect SDK error.
 #[derive(Error, Debug)]
 pub enum SimConnectError {
+    /// SimConnect error.
     #[error("SimConnect error: {0}")]
     SimConnectError(i32),
     #[error("SimConnect unrecognized: {0}")]
+    /// SimConnect unrecognized error. Occurs when an unimplemented event is received by the SDK.
     SimConnectUnrecognizedEvent(u32),
+    /// Object already registered with the client instance.
     #[error("Object `{0}` has already been registered")]
     ObjectAlreadyRegistered(String),
+    /// Object mismatch.
+    #[error("Tried to convert object of type {actual} to {expected}")]
+    ObjectMismatch { actual: String, expected: String },
+    /// Conversation error.
     #[error("Conversion error: {0}")]
     ConversionError(#[from] std::num::TryFromIntError),
+    /// Unexpected error.
     #[error("Unexpected error: {0}")]
     UnexpectedError(String),
 }