Run clippy using the stable toolchain

So far we were running clippy on our minimum supported Rust version in
CI. Doing so is fine conceptually, but it means one more version to
update. What's more, we also don't get the latest and greatest
suggestions that clippy provides.
With this change we switch to running clippy on the most recent stable
toolchain, which fixes these problems.

Author: d-e-s-o

.github/workflows/ci.yml

@@ -48,7 +48,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.57.0
+          toolchain: stable
           components: clippy
           override: true
       - run: cargo clippy --no-deps --all-targets --all-features -- -A unknown_lints -D warnings

src/lib.rs

@@ -1,4 +1,4 @@
-// Copyright (C) 2019-2021 Daniel Mueller <[email protected]>
+// Copyright (C) 2019-2022 Daniel Mueller <[email protected]>
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #![warn(
@@ -43,6 +43,7 @@
   where_clauses_object_safety,
   while_true
 )]
+#![allow(clippy::let_unit_value)]
 
 //! A crate for converting data on a WebSocket channel into a stream of
 //! JSON decoded objects.

src/wrap.rs

@@ -216,6 +216,7 @@ impl Pinger {
   }
 
   /// Attempt to advance the ping state by one step.
+  #[allow(clippy::result_large_err)]
   fn advance<S>(&mut self, sink: &mut S, ctx: &mut Context<'_>) -> Result<(), S::Error>
   where
     S: Sink<WebSocketMessage, Error = WebSocketError> + Unpin,