use thiserror instead of derive_more for error handling (#10696)

* use thiserror instead of derive_more for error handling

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Update utils/prometheus/src/lib.rs

* Update utils/prometheus/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/client/beefy/rpc/Cargo.toml

@@ -8,7 +8,6 @@ repository = "https://github.com/paritytech/substrate"
 description = "RPC for the BEEFY Client gadget for substrate"
 
 [dependencies]
-derive_more = "0.99"
 futures = "0.3.16"
 log = "0.4"
 parking_lot = "0.11"

substrate/client/beefy/rpc/src/lib.rs

@@ -36,15 +36,15 @@ mod notification;
 
 type FutureResult<T> = jsonrpc_core::BoxFuture<Result<T, jsonrpc_core::Error>>;
 
-#[derive(Debug, derive_more::Display, derive_more::From, thiserror::Error)]
+#[derive(Debug, thiserror::Error)]
 /// Top-level error type for the RPC handler
 pub enum Error {
 	/// The BEEFY RPC endpoint is not ready.
-	#[display(fmt = "BEEFY RPC endpoint not ready")]
+	#[error("BEEFY RPC endpoint not ready")]
 	EndpointNotReady,
 	/// The BEEFY RPC background task failed to spawn.
-	#[display(fmt = "BEEFY RPC background task failed to spawn")]
-	RpcTaskFailure(SpawnError),
+	#[error("BEEFY RPC background task failed to spawn")]
+	RpcTaskFailure(#[from] SpawnError),
 }
 
 /// The error codes returned by jsonrpc.