Fix Rust beta compiler errors 1.78.0-beta.1 (#5439)

* remove redundant imports

* fix test

* contains key

* fmt

* Merge branch 'unstable' into fix-beta-compiler

beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs

@@ -3,7 +3,7 @@ use crate::rpc::{
     codec::base::OutboundCodec,
     protocol::{Encoding, ProtocolId, RPCError, SupportedProtocol, ERROR_TYPE_MAX, ERROR_TYPE_MIN},
 };
-use crate::rpc::{InboundRequest, OutboundRequest, RPCCodedResponse, RPCResponse};
+use crate::rpc::{InboundRequest, OutboundRequest};
 use libp2p::bytes::BytesMut;
 use snap::read::FrameDecoder;
 use snap::write::FrameEncoder;
@@ -676,22 +676,13 @@ fn context_bytes_to_fork_name(
 mod tests {
 
     use super::*;
-    use crate::rpc::{protocol::*, MetaData};
-    use crate::{
-        rpc::{methods::StatusMessage, Ping, RPCResponseErrorCode},
-        types::{EnrAttestationBitfield, EnrSyncCommitteeBitfield},
-    };
-    use std::sync::Arc;
+    use crate::rpc::protocol::*;
+    use crate::types::{EnrAttestationBitfield, EnrSyncCommitteeBitfield};
     use types::{
         blob_sidecar::BlobIdentifier, BeaconBlock, BeaconBlockAltair, BeaconBlockBase,
-        BeaconBlockMerge, ChainSpec, EmptyBlock, Epoch, ForkContext, FullPayload, Hash256,
-        Signature, SignedBeaconBlock, Slot,
+        BeaconBlockMerge, EmptyBlock, Epoch, FullPayload, Signature, Slot,
     };
 
-    use snap::write::FrameEncoder;
-    use ssz::Encode;
-    use std::io::Write;
-
     type Spec = types::MainnetEthSpec;
 
     fn fork_context(fork_name: ForkName) -> ForkContext {

beacon_node/lighthouse_network/src/rpc/handler.rs

@@ -9,7 +9,7 @@ use crate::rpc::outbound::{OutboundFramed, OutboundRequest};
 use crate::rpc::protocol::InboundFramed;
 use fnv::FnvHashMap;
 use futures::prelude::*;
-use futures::{Sink, SinkExt};
+use futures::SinkExt;
 use libp2p::swarm::handler::{
     ConnectionEvent, ConnectionHandler, ConnectionHandlerEvent, DialUpgradeError,
     FullyNegotiatedInbound, FullyNegotiatedOutbound, StreamUpgradeError, SubstreamProtocol,

beacon_node/lighthouse_network/src/rpc/methods.rs

@@ -6,6 +6,7 @@ use serde::Serialize;
 use ssz::Encode;
 use ssz_derive::{Decode, Encode};
 use ssz_types::{typenum::U256, VariableList};
+use std::fmt::Display;
 use std::marker::PhantomData;
 use std::ops::Deref;
 use std::sync::Arc;
@@ -44,11 +45,13 @@ impl Deref for ErrorType {
     }
 }
 
-impl ToString for ErrorType {
-    fn to_string(&self) -> String {
+impl Display for ErrorType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         #[allow(clippy::invalid_regex)]
         let re = Regex::new("\\p{C}").expect("Regex is valid");
-        String::from_utf8_lossy(&re.replace_all(self.0.deref(), &b""[..])).to_string()
+        let error_type_str =
+            String::from_utf8_lossy(&re.replace_all(self.0.deref(), &b""[..])).to_string();
+        write!(f, "{}", error_type_str)
     }
 }
 
@@ -580,7 +583,7 @@ impl<T: EthSpec> std::fmt::Display for RPCCodedResponse<T> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             RPCCodedResponse::Success(res) => write!(f, "{}", res),
-            RPCCodedResponse::Error(code, err) => write!(f, "{}: {}", code, err.to_string()),
+            RPCCodedResponse::Error(code, err) => write!(f, "{}: {}", code, err),
             RPCCodedResponse::StreamTermination(_) => write!(f, "Stream Termination"),
         }
     }

beacon_node/lighthouse_network/src/rpc/outbound.rs

@@ -2,11 +2,10 @@ use super::methods::*;
 use super::protocol::ProtocolId;
 use super::protocol::SupportedProtocol;
 use super::RPCError;
-use crate::rpc::protocol::Encoding;
-use crate::rpc::{
-    codec::{base::BaseOutboundCodec, ssz_snappy::SSZSnappyOutboundCodec, OutboundCodec},
-    methods::ResponseTermination,
+use crate::rpc::codec::{
+    base::BaseOutboundCodec, ssz_snappy::SSZSnappyOutboundCodec, OutboundCodec,
 };
+use crate::rpc::protocol::Encoding;
 use futures::future::BoxFuture;
 use futures::prelude::{AsyncRead, AsyncWrite};
 use futures::{FutureExt, SinkExt};

beacon_node/lighthouse_network/src/rpc/protocol.rs

@@ -1,8 +1,5 @@
 use super::methods::*;
-use crate::rpc::{
-    codec::{base::BaseInboundCodec, ssz_snappy::SSZSnappyInboundCodec, InboundCodec},
-    methods::{MaxErrorLen, ResponseTermination, MAX_ERROR_LEN},
-};
+use crate::rpc::codec::{base::BaseInboundCodec, ssz_snappy::SSZSnappyInboundCodec, InboundCodec};
 use futures::future::BoxFuture;
 use futures::prelude::{AsyncRead, AsyncWrite};
 use futures::{FutureExt, StreamExt};

beacon_node/lighthouse_network/src/rpc/rate_limiter.rs

@@ -3,7 +3,6 @@ use crate::rpc::Protocol;
 use fnv::FnvHashMap;
 use libp2p::PeerId;
 use serde::{Deserialize, Serialize};
-use std::convert::TryInto;
 use std::future::Future;
 use std::hash::Hash;
 use std::pin::Pin;