use thiserror instead of derive_more for error handling

Cargo.toml

@@ -23,3 +23,4 @@ members = [
 	"template/node",
 	"template/runtime",
 ]
+resolver = "2"

client/consensus/Cargo.toml

@@ -24,6 +24,6 @@ sc-consensus = { version = "0.10.0-dev", git = "https://github.com/paritytech/su
 log = "0.4.8"
 futures = { version = "0.3.17", features = ["compat"] }
 sp-timestamp = { version = "4.0.0-dev", git = "https://github.com/paritytech/substrate" }
-derive_more = "0.99.2"
+thiserror = "1.0"
 prometheus-endpoint = { version = "0.9.0", package = "substrate-prometheus-endpoint", git = "https://github.com/paritytech/substrate" }
-async-trait = "0.1"
+async-trait = "0.1"

client/consensus/src/lib.rs

@@ -28,13 +28,13 @@ use sp_consensus::Error as ConsensusError;
 use sp_runtime::traits::{Block as BlockT, Header as HeaderT};
 use std::{collections::HashMap, marker::PhantomData, sync::Arc};
 
-#[derive(derive_more::Display, Debug)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
-	#[display(fmt = "Multiple runtime Ethereum blocks, rejecting!")]
+	#[error("Multiple runtime Ethereum blocks, rejecting!")]
 	MultipleRuntimeLogs,
-	#[display(fmt = "Runtime Ethereum block not found, rejecting!")]
+	#[error("Runtime Ethereum block not found, rejecting!")]
 	NoRuntimeLog,
-	#[display(fmt = "Cannot access the runtime at genesis, rejecting!")]
+	#[error("Cannot access the runtime at genesis, rejecting!")]
 	RuntimeApiCallFailed,
 }
 

frame/ethereum/Cargo.toml

@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 description = "Ethereum compatibility full block processing emulation pallet for Substrate."
 license = "Apache-2.0"
-resolver = "2"
 
 [dependencies]
 rustc-hex = { version = "2.1.0", default-features = false }