make some enums non-exhaustive (#2140)

packages/liveview/src/query.rs

@@ -260,6 +260,7 @@ impl<V: DeserializeOwned> Drop for Query<V> {
 }
 
 #[derive(Error, Debug)]
+#[non_exhaustive]
 pub enum QueryError {
     #[error("Error receiving query result: {0}")]
     Recv(RecvError),