introduce errors with info (#1834)

polkadot/node/network/statement-distribution/Cargo.toml

@@ -7,13 +7,9 @@ edition = "2018"
 
 [dependencies]
 futures = "0.3.5"
-log = "0.4.8"
-futures-timer = "3.0.2"
-streamunordered = "0.5.1"
+log = "0.4.11"
 polkadot-primitives = { path = "../../../primitives" }
 node-primitives = { package = "polkadot-node-primitives", path = "../../primitives" }
-parity-scale-codec = "1.3.4"
-sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master" }
 sp-staking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 polkadot-subsystem = { package = "polkadot-node-subsystem", path = "../../subsystem" }
 polkadot-node-subsystem-util = { path = "../../subsystem-util" }
@@ -22,7 +18,6 @@ arrayvec = "0.5.1"
 indexmap = "1.4.0"
 
 [dev-dependencies]
-parking_lot = "0.10.0"
 polkadot-node-subsystem-test-helpers = { path = "../../subsystem-test-helpers" }
 assert_matches = "1.3.0"
 sp-keyring = { git = "https://github.com/paritytech/substrate", branch = "master" }

polkadot/node/network/statement-distribution/src/lib.rs

@@ -19,6 +19,9 @@
 //! This is responsible for distributing signed statements about candidate
 //! validity amongst validators.
 
+#![deny(unused_crate_dependencies)]
+#![warn(missing_docs)]
+
 use polkadot_subsystem::{
 	Subsystem, SubsystemResult, SubsystemContext, SpawnedSubsystem,
 	ActiveLeavesUpdate, FromOverseer, OverseerSignal,