Bump to 2021 edition, inline formats, lints

* Bump Rust edition 2018 -> 2021
* Use new inline formatting, i.e. `format!("{v}")` instead of `format!("{}", v)` (simple cases only)
* use more specific asserts like `assert_ne!`
* ignore intellij IDE files
* remove a few un-needed namespace prefixes

bb8/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.8.0"
 description = "Full-featured async (tokio-based) connection pool (like r2d2)"
 license = "MIT"
 repository = "https://github.com/djc/bb8"
-edition = "2018"
+edition = "2021"
 workspace = ".."
 readme = "../README.md"
 

bb8/src/api.rs

@@ -382,7 +382,7 @@ where
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
-            RunError::User(ref err) => write!(f, "{}", err),
+            RunError::User(ref err) => write!(f, "{err}"),
             RunError::TimedOut => write!(f, "Timed out in bb8"),
         }
     }

postgres/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.8.1"
 description = "Full-featured async (tokio-based) postgres connection pool (like r2d2)"
 license = "MIT"
 repository = "https://github.com/djc/bb8"
-edition = "2018"
+edition = "2021"
 
 [features]
 "with-bit-vec-0_6" = ["tokio-postgres/with-bit-vec-0_6"]

postgres/examples/hyper.rs

@@ -22,7 +22,7 @@ async fn main() {
 
     let pool = match Pool::builder().build(pg_mgr).await {
         Ok(pool) => pool,
-        Err(e) => panic!("bb8 error {}", e),
+        Err(e) => panic!("bb8 error {e}"),
     };
 
     let _ = Server::bind(&addr)
@@ -40,7 +40,7 @@ async fn main() {
                             }
                             Err(e) => {
                                 println!("Sending error response");
-                                Response::new(Body::from(format!("Internal error {:?}", e)))
+                                Response::new(Body::from(format!("Internal error {e:?}")))
                             }
                         })
                     }
@@ -57,5 +57,5 @@ async fn handler(
     let stmt = conn.prepare("SELECT 1").await?;
     let row = conn.query_one(&stmt, &[]).await?;
     let v = row.get::<usize, i32>(0);
-    Ok(Response::new(Body::from(format!("Got results {:?}", v))))
+    Ok(Response::new(Body::from(format!("Got results {v:?}"))))
 }

postgres/examples/static_select.rs

@@ -17,7 +17,7 @@ async fn main() {
 
     let pool = match Pool::builder().build(pg_mgr).await {
         Ok(pool) => pool,
-        Err(e) => panic!("builder error: {:?}", e),
+        Err(e) => panic!("builder error: {e:?}"),
     };
 
     let connection = pool.get().await.unwrap();

redis/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.11.0"
 description = "Full-featured async (tokio-based) redis connection pool (like r2d2)"
 license = "MIT"
 repository = "https://github.com/djc/bb8"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 async-trait = "0.1"