Update edition and set MSRV to 1.66 (#22)

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: "1.41.1"
+          toolchain: "1.66"
           default: true
 
       - run: cargo check

Cargo.toml

@@ -2,14 +2,15 @@
 name = "sluice"
 version = "0.5.5"
 authors = ["Stephen M. Coakley <[email protected]>"]
-edition = "2018"
+edition = "2021"
 description = "Efficient ring buffer for byte buffers, FIFO queues, and SPSC channels"
 documentation = "https://docs.rs/sluice"
 repository = "https://github.com/sagebind/sluice"
 readme = "README.md"
 keywords = ["buffer", "pipe", "channel"]
 categories = ["asynchronous", "concurrency", "data-structures"]
 license = "MIT"
+rust-version = "1.66"
 
 [dependencies]
 async-channel = "1"

README.md

@@ -5,11 +5,17 @@ Asynchronous byte buffers and pipes for concurrent I/O programming.
 [![Crates.io](https://img.shields.io/crates/v/sluice.svg)](https://crates.io/crates/sluice)
 [![Documentation](https://docs.rs/sluice/badge.svg)](https://docs.rs/sluice)
 ![License](https://img.shields.io/badge/license-MIT-blue.svg)
+[![Minimum supported Rust version](https://img.shields.io/badge/rustc-1.66+-yellow.svg)](#minimum-supported-rust-version)
+[![Build](https://github.com/sagebind/sluice/workflows/ci/badge.svg)](https://github.com/sagebind/sluice/actions)
 
 ## [Documentation]
 
 Check the [documentation] for up-to-date usage and examples.
 
+## Minimum supported Rust version
+
+The minimum supported Rust version (or _MSRV_) for Castaway is **stable Rust 1.66 or greater**, meaning we only guarantee that Castaway will compile if you use a rustc version of at least 1.66.
+
 ## Sponsors
 
 Special thanks to sponsors of my open-source work!

tests/pipe.rs

@@ -104,7 +104,7 @@ fn read_write_chunks_random(chunks: u8) {
             async {
                 for _chunk in 0..chunks {
                     let mut buf = data.clone();
-                    reader.read(&mut buf).await.unwrap();
+                    let _ = reader.read(&mut buf).await.unwrap();
                     assert_eq!(&buf[..], &data[..]);
                 }
             },