diff --git a/examples/mysql/todos/src/main.rs b/examples/mysql/todos/src/main.rs
index 34abd30075..dee224ba8a 100644
--- a/examples/mysql/todos/src/main.rs
+++ b/examples/mysql/todos/src/main.rs
@@ -21,16 +21,16 @@ async fn main() -> anyhow::Result<()> {
 
     match args.cmd {
         Some(Command::Add { description }) => {
-            println!("Adding new todo with description '{}'", &description);
+            println!("Adding new todo with description '{description}'");
             let todo_id = add_todo(&pool, description).await?;
-            println!("Added new todo with id {}", todo_id);
+            println!("Added new todo with id {todo_id}");
         }
         Some(Command::Done { id }) => {
-            println!("Marking todo {} as done", id);
+            println!("Marking todo {id} as done");
             if complete_todo(&pool, id).await? {
-                println!("Todo {} is marked as done", id);
+                println!("Todo {id} is marked as done");
             } else {
-                println!("Invalid id {}", id);
+                println!("Invalid id {id}");
             }
         }
         None => {
diff --git a/examples/postgres/axum-social-with-tests/src/http/error.rs b/examples/postgres/axum-social-with-tests/src/http/error.rs
index effb518ba4..fc4fd5ea1f 100644
--- a/examples/postgres/axum-social-with-tests/src/http/error.rs
+++ b/examples/postgres/axum-social-with-tests/src/http/error.rs
@@ -49,7 +49,7 @@ impl IntoResponse for Error {
 
         // Normally you wouldn't just print this, but it's useful for debugging without
         // using a logging framework.
-        println!("API error: {:?}", self);
+        println!("API error: {self:?}");
 
         (
             self.status_code(),
diff --git a/examples/postgres/axum-social-with-tests/tests/common.rs b/examples/postgres/axum-social-with-tests/tests/common.rs
index 41abd3af10..51751a52c3 100644
--- a/examples/postgres/axum-social-with-tests/tests/common.rs
+++ b/examples/postgres/axum-social-with-tests/tests/common.rs
@@ -53,14 +53,14 @@ pub async fn response_json(resp: &mut Response<BoxBody>) -> serde_json::Value {
 pub fn expect_string(value: &serde_json::Value) -> &str {
     value
         .as_str()
-        .unwrap_or_else(|| panic!("expected string, got {:?}", value))
+        .unwrap_or_else(|| panic!("expected string, got {value:?}"))
 }
 
 #[track_caller]
 pub fn expect_uuid(value: &serde_json::Value) -> Uuid {
     expect_string(value)
         .parse::<Uuid>()
-        .unwrap_or_else(|e| panic!("failed to parse UUID from {:?}: {}", value, e))
+        .unwrap_or_else(|e| panic!("failed to parse UUID from {value:?}: {e}"))
 }
 
 #[track_caller]
@@ -68,5 +68,5 @@ pub fn expect_rfc3339_timestamp(value: &serde_json::Value) -> OffsetDateTime {
     let s = expect_string(value);
 
     OffsetDateTime::parse(s, &Rfc3339)
-        .unwrap_or_else(|e| panic!("failed to parse RFC-3339 timestamp from {:?}: {}", value, e))
+        .unwrap_or_else(|e| panic!("failed to parse RFC-3339 timestamp from {value:?}: {e}"))
 }
diff --git a/examples/postgres/chat/src/main.rs b/examples/postgres/chat/src/main.rs
index 6a63b0e091..63ee0193b1 100644
--- a/examples/postgres/chat/src/main.rs
+++ b/examples/postgres/chat/src/main.rs
@@ -157,7 +157,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
     terminal.show_cursor()?;
 
     if let Err(err) = res {
-        println!("{:?}", err)
+        println!("{err:?}")
     }
 
     Ok(())
diff --git a/examples/postgres/files/src/main.rs b/examples/postgres/files/src/main.rs
index 326b32178c..ac77a7c49d 100644
--- a/examples/postgres/files/src/main.rs
+++ b/examples/postgres/files/src/main.rs
@@ -41,7 +41,7 @@ async fn main() -> anyhow::Result<()> {
         .await?;
 
     for post_with_author in posts_with_authors {
-        println!("{}", post_with_author);
+        println!("{post_with_author}");
     }
 
     Ok(())
diff --git a/examples/postgres/json/src/main.rs b/examples/postgres/json/src/main.rs
index ce218d04bf..59f3c14823 100644
--- a/examples/postgres/json/src/main.rs
+++ b/examples/postgres/json/src/main.rs
@@ -47,7 +47,7 @@ async fn main() -> anyhow::Result<()> {
             );
 
             let person_id = add_person(&pool, person).await?;
-            println!("Added new person with ID {}", person_id);
+            println!("Added new person with ID {person_id}");
         }
         None => {
             println!("Printing all people");
diff --git a/examples/postgres/listen/src/main.rs b/examples/postgres/listen/src/main.rs
index 4d3e1db044..0a571d3071 100644
--- a/examples/postgres/listen/src/main.rs
+++ b/examples/postgres/listen/src/main.rs
@@ -38,7 +38,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let mut counter = 0usize;
     loop {
         let notification = listener.recv().await?;
-        println!("[from recv]: {:?}", notification);
+        println!("[from recv]: {notification:?}");
 
         counter += 1;
         if counter >= 3 {
@@ -58,7 +58,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         tokio::select! {
             res = stream.try_next() => {
                 if let Some(notification) = res? {
-                    println!("[from stream]: {:?}", notification);
+                    println!("[from stream]: {notification:?}");
                 } else {
                     break;
                 }
@@ -106,5 +106,5 @@ from (
     .execute(pool)
     .await;
 
-    println!("[from notify]: {:?}", res);
+    println!("[from notify]: {res:?}");
 }
diff --git a/examples/postgres/mockable-todos/src/main.rs b/examples/postgres/mockable-todos/src/main.rs
index 89016d7d4b..f541580c66 100644
--- a/examples/postgres/mockable-todos/src/main.rs
+++ b/examples/postgres/mockable-todos/src/main.rs
@@ -39,14 +39,14 @@ async fn handle_command(
                 &description
             )?;
             let todo_id = todo_repo.add_todo(description).await?;
-            writeln!(writer, "Added new todo with id {}", todo_id)?;
+            writeln!(writer, "Added new todo with id {todo_id}")?;
         }
         Some(Command::Done { id }) => {
-            writeln!(writer, "Marking todo {} as done", id)?;
+            writeln!(writer, "Marking todo {id} as done")?;
             if todo_repo.complete_todo(id).await? {
-                writeln!(writer, "Todo {} is marked as done", id)?;
+                writeln!(writer, "Todo {id} is marked as done")?;
             } else {
-                writeln!(writer, "Invalid id {}", id)?;
+                writeln!(writer, "Invalid id {id}")?;
             }
         }
         None => {
diff --git a/examples/postgres/todos/src/main.rs b/examples/postgres/todos/src/main.rs
index d7400fe240..22b268bad0 100644
--- a/examples/postgres/todos/src/main.rs
+++ b/examples/postgres/todos/src/main.rs
@@ -21,16 +21,16 @@ async fn main() -> anyhow::Result<()> {
 
     match args.cmd {
         Some(Command::Add { description }) => {
-            println!("Adding new todo with description '{}'", &description);
+            println!("Adding new todo with description '{description}'");
             let todo_id = add_todo(&pool, description).await?;
-            println!("Added new todo with id {}", todo_id);
+            println!("Added new todo with id {todo_id}");
         }
         Some(Command::Done { id }) => {
-            println!("Marking todo {} as done", id);
+            println!("Marking todo {id} as done");
             if complete_todo(&pool, id).await? {
-                println!("Todo {} is marked as done", id);
+                println!("Todo {id} is marked as done");
             } else {
-                println!("Invalid id {}", id);
+                println!("Invalid id {id}");
             }
         }
         None => {
diff --git a/examples/sqlite/todos/src/main.rs b/examples/sqlite/todos/src/main.rs
index a06d52e4eb..6459cbb406 100644
--- a/examples/sqlite/todos/src/main.rs
+++ b/examples/sqlite/todos/src/main.rs
@@ -21,16 +21,16 @@ async fn main() -> anyhow::Result<()> {
 
     match args.cmd {
         Some(Command::Add { description }) => {
-            println!("Adding new todo with description '{}'", &description);
+            println!("Adding new todo with description '{description}'");
             let todo_id = add_todo(&pool, description).await?;
-            println!("Added new todo with id {}", todo_id);
+            println!("Added new todo with id {todo_id}");
         }
         Some(Command::Done { id }) => {
-            println!("Marking todo {} as done", id);
+            println!("Marking todo {id} as done");
             if complete_todo(&pool, id).await? {
-                println!("Todo {} is marked as done", id);
+                println!("Todo {id} is marked as done");
             } else {
-                println!("Invalid id {}", id);
+                println!("Invalid id {id}");
             }
         }
         None => {
diff --git a/sqlx-bench/benches/pg_pool.rs b/sqlx-bench/benches/pg_pool.rs
index 4fdce3b6b6..ccea9bc6a9 100644
--- a/sqlx-bench/benches/pg_pool.rs
+++ b/sqlx-bench/benches/pg_pool.rs
@@ -12,7 +12,7 @@ fn bench_pgpool_acquire(c: &mut Criterion) {
             let fairness = if fair { "(fair)" } else { "(unfair)" };
 
             group.bench_with_input(
-                format!("{} concurrent {}", concurrent, fairness),
+                format!("{concurrent} concurrent {fairness}"),
                 &(concurrent, fair),
                 |b, &(concurrent, fair)| do_bench_acquire(b, concurrent, fair),
             );
@@ -47,7 +47,7 @@ fn do_bench_acquire(b: &mut Bencher, concurrent: u32, fair: bool) {
                     let conn = match pool.acquire().await {
                         Ok(conn) => conn,
                         Err(sqlx::Error::PoolClosed) => break,
-                        Err(e) => panic!("failed to acquire concurrent connection: {}", e),
+                        Err(e) => panic!("failed to acquire concurrent connection: {e}"),
                     };
 
                     // pretend we're using the connection
diff --git a/sqlx-bench/benches/sqlite_fetch_all.rs b/sqlx-bench/benches/sqlite_fetch_all.rs
index ba6f6f71d5..8be770a213 100644
--- a/sqlx-bench/benches/sqlite_fetch_all.rs
+++ b/sqlx-bench/benches/sqlite_fetch_all.rs
@@ -37,7 +37,7 @@ fn main() -> sqlx::Result<()> {
             );
 
             let elapsed = chrono::Utc::now() - start;
-            println!("elapsed {}", elapsed);
+            println!("elapsed {elapsed}");
         }
 
         Ok(())
diff --git a/sqlx-cli/src/database.rs b/sqlx-cli/src/database.rs
index 0a5461a97b..d4d160049d 100644
--- a/sqlx-cli/src/database.rs
+++ b/sqlx-cli/src/database.rs
@@ -73,7 +73,7 @@ fn ask_to_continue(connect_opts: &ConnectOpts) -> bool {
                 }
             }
             Err(e) => {
-                println!("{}", e);
+                println!("{e}");
                 return false;
             }
         }
diff --git a/sqlx-cli/src/migrate.rs b/sqlx-cli/src/migrate.rs
index 5e94f26f41..42139aa644 100644
--- a/sqlx-cli/src/migrate.rs
+++ b/sqlx-cli/src/migrate.rs
@@ -48,7 +48,7 @@ impl MigrationOrdering {
     }
 
     fn sequential(version: i64) -> MigrationOrdering {
-        Self::Sequential(format!("{:04}", version))
+        Self::Sequential(format!("{version:04}"))
     }
 
     fn file_prefix(&self) -> &str {
@@ -149,7 +149,7 @@ pub async fn add(
 
     if !has_existing_migrations {
         let quoted_source = if migration_source != "migrations" {
-            format!("{:?}", migration_source)
+            format!("{migration_source:?}")
         } else {
             "".to_string()
         };
@@ -178,7 +178,7 @@ See: https://docs.rs/sqlx/0.5/sqlx/macro.migrate.html
 fn short_checksum(checksum: &[u8]) -> String {
     let mut s = String::with_capacity(checksum.len() * 2);
     for b in checksum {
-        write!(&mut s, "{:02x?}", b).expect("should not fail to write to str");
+        write!(&mut s, "{b:02x?}").expect("should not fail to write to str");
     }
     s
 }
@@ -312,7 +312,7 @@ pub async fn run(
                     style(migration.version).cyan(),
                     style(migration.migration_type.label()).green(),
                     migration.description,
-                    style(format!("({:?})", elapsed)).dim()
+                    style(format!("({elapsed:?})")).dim()
                 );
             }
         }
@@ -374,7 +374,7 @@ pub async fn revert(
                 style(migration.version).cyan(),
                 style(migration.migration_type.label()).green(),
                 migration.description,
-                style(format!("({:?})", elapsed)).dim()
+                style(format!("({elapsed:?})")).dim()
             );
 
             is_applied = true;
@@ -406,9 +406,8 @@ pub fn build_script(migration_source: &str, force: bool) -> anyhow::Result<()> {
         r#"// generated by `sqlx migrate build-script`
 fn main() {{
     // trigger recompilation when a new migration is added
-    println!("cargo:rerun-if-changed={}");
+    println!("cargo:rerun-if-changed={migration_source}");
 }}"#,
-        migration_source
     );
 
     fs::write("build.rs", contents)?;
diff --git a/sqlx-cli/src/migration.rs b/sqlx-cli/src/migration.rs
index b69f6a83fc..2ed8f94495 100644
--- a/sqlx-cli/src/migration.rs
+++ b/sqlx-cli/src/migration.rs
@@ -30,7 +30,7 @@ pub fn add_file(name: &str) -> anyhow::Result<()> {
     file.write_all(b"-- Add migration script here")
         .context("Could not write to file")?;
 
-    println!("Created migration: '{}'", file_name);
+    println!("Created migration: '{file_name}'");
     Ok(())
 }
 
@@ -143,7 +143,7 @@ fn load_migrations() -> anyhow::Result<Vec<Migration>> {
 
                 if let Some(ext) = e.path().extension() {
                     if ext != "sql" {
-                        println!("Wrong ext: {:?}", ext);
+                        println!("Wrong ext: {ext:?}");
                         continue;
                     }
                 } else {
diff --git a/sqlx-cli/src/prepare.rs b/sqlx-cli/src/prepare.rs
index 5ecaabcb5f..588deb05ff 100644
--- a/sqlx-cli/src/prepare.rs
+++ b/sqlx-cli/src/prepare.rs
@@ -252,7 +252,7 @@ fn minimal_project_clean(
     for file in touch_paths {
         let now = filetime::FileTime::now();
         filetime::set_file_times(&file, now, now)
-            .with_context(|| format!("Failed to update mtime for {:?}", file))?;
+            .with_context(|| format!("Failed to update mtime for {file:?}"))?;
     }
 
     // Clean entire packages.
diff --git a/sqlx-core/src/any/driver.rs b/sqlx-core/src/any/driver.rs
index 12355beca2..b89688d8a1 100644
--- a/sqlx-core/src/any/driver.rs
+++ b/sqlx-core/src/any/driver.rs
@@ -139,6 +139,6 @@ pub(crate) fn from_url(url: &Url) -> crate::Result<&'static AnyDriver> {
         .iter()
         .find(|driver| driver.url_schemes.contains(&url.scheme()))
         .ok_or_else(|| {
-            Error::Configuration(format!("no driver found for URL scheme {:?}", scheme).into())
+            Error::Configuration(format!("no driver found for URL scheme {scheme:?}").into())
         })
 }
diff --git a/sqlx-core/src/any/kind.rs b/sqlx-core/src/any/kind.rs
index b8e7b3fb50..e4604fe7ec 100644
--- a/sqlx-core/src/any/kind.rs
+++ b/sqlx-core/src/any/kind.rs
@@ -61,7 +61,7 @@ impl FromStr for AnyKind {
                 Err(Error::Configuration("database URL has the scheme of a MSSQL database but the `mssql` feature is not enabled".into()))
             }
 
-            _ => Err(Error::Configuration(format!("unrecognized database url: {:?}", url).into()))
+            _ => Err(Error::Configuration(format!("unrecognized database url: {url:?}").into()))
         }
     }
 }
diff --git a/sqlx-core/src/any/row.rs b/sqlx-core/src/any/row.rs
index cd9e643aaa..2381902311 100644
--- a/sqlx-core/src/any/row.rs
+++ b/sqlx-core/src/any/row.rs
@@ -60,7 +60,7 @@ impl Row for AnyRow {
             T::decode(value)
         }
         .map_err(|source| Error::ColumnDecode {
-            index: format!("{:?}", index),
+            index: format!("{index:?}"),
             source,
         })
     }
diff --git a/sqlx-core/src/describe.rs b/sqlx-core/src/describe.rs
index 26051a7f08..887d83c75d 100644
--- a/sqlx-core/src/describe.rs
+++ b/sqlx-core/src/describe.rs
@@ -80,8 +80,7 @@ impl<DB: Database> Describe<DB> {
                         AnyTypeInfo::try_from(type_info).map_err(|_| {
                             crate::Error::AnyDriverError(
                                 format!(
-                                    "Any driver does not support type {} of parameter {}",
-                                    type_info, i
+                                    "Any driver does not support type {type_info} of parameter {i}"
                                 )
                                 .into(),
                             )
diff --git a/sqlx-core/src/error.rs b/sqlx-core/src/error.rs
index 11d79ab6cf..5c4c223fad 100644
--- a/sqlx-core/src/error.rs
+++ b/sqlx-core/src/error.rs
@@ -253,10 +253,7 @@ impl dyn DatabaseError {
     /// specific error type. In other cases, use `try_downcast_ref`.
     pub fn downcast_ref<E: DatabaseError>(&self) -> &E {
         self.try_downcast_ref().unwrap_or_else(|| {
-            panic!(
-                "downcast to wrong DatabaseError type; original error: {}",
-                self
-            )
+            panic!("downcast to wrong DatabaseError type; original error: {self}")
         })
     }
 
@@ -268,12 +265,8 @@ impl dyn DatabaseError {
     /// `Error::downcast` which returns `Option<E>`. In normal usage, you should know the
     /// specific error type. In other cases, use `try_downcast`.
     pub fn downcast<E: DatabaseError>(self: Box<Self>) -> Box<E> {
-        self.try_downcast().unwrap_or_else(|e| {
-            panic!(
-                "downcast to wrong DatabaseError type; original error: {}",
-                e
-            )
-        })
+        self.try_downcast()
+            .unwrap_or_else(|e| panic!("downcast to wrong DatabaseError type; original error: {e}"))
     }
 
     /// Downcast a reference to this generic database error to a specific
diff --git a/sqlx-core/src/executor.rs b/sqlx-core/src/executor.rs
index 769a7aede4..05020bb1e5 100644
--- a/sqlx-core/src/executor.rs
+++ b/sqlx-core/src/executor.rs
@@ -202,7 +202,7 @@ pub trait Execute<'q, DB: Database>: Send + Sized {
 }
 
 // NOTE: `Execute` is explicitly not implemented for String and &String to make it slightly more
-//       involved to write `conn.execute(format!("SELECT {}", val))`
+//       involved to write `conn.execute(format!("SELECT {val}"))`
 impl<'q, DB: Database> Execute<'q, DB> for &'q str {
     #[inline]
     fn sql(&self) -> &'q str {
diff --git a/sqlx-core/src/query_builder.rs b/sqlx-core/src/query_builder.rs
index 5f2c28baad..75c2bd995c 100644
--- a/sqlx-core/src/query_builder.rs
+++ b/sqlx-core/src/query_builder.rs
@@ -116,7 +116,7 @@ where
     pub fn push(&mut self, sql: impl Display) -> &mut Self {
         self.sanity_check();
 
-        write!(self.query, "{}", sql).expect("error formatting `sql`");
+        write!(self.query, "{sql}").expect("error formatting `sql`");
 
         self
     }
@@ -258,9 +258,9 @@ where
     /// // This would normally produce values forever!
     /// let users = (0..).map(|i| User {
     ///     id: i,
-    ///     username: format!("test_user_{}", i),
-    ///     email: format!("test-user-{}@example.com", i),
-    ///     password: format!("Test!User@Password#{}", i),
+    ///     username: format!("test_user_{i}"),
+    ///     email: format!("test-user-{i}@example.com"),
+    ///     password: format!("Test!User@Password#{i}"),
     /// });
     ///
     /// let mut query_builder: QueryBuilder<MySql> = QueryBuilder::new(
@@ -365,9 +365,9 @@ where
     /// // This would normally produce values forever!
     /// let users = (0..).map(|i| User {
     ///     id: i,
-    ///     username: format!("test_user_{}", i),
-    ///     email: format!("test-user-{}@example.com", i),
-    ///     password: format!("Test!User@Password#{}", i),
+    ///     username: format!("test_user_{i}"),
+    ///     email: format!("test-user-{i}@example.com"),
+    ///     password: format!("Test!User@Password#{i}"),
     /// });
     ///
     /// let mut query_builder: QueryBuilder<MySql> = QueryBuilder::new(
diff --git a/sqlx-core/src/row.rs b/sqlx-core/src/row.rs
index 91181390de..9fadbf6bd9 100644
--- a/sqlx-core/src/row.rs
+++ b/sqlx-core/src/row.rs
@@ -121,14 +121,14 @@ pub trait Row: Unpin + Send + Sync + 'static {
 
             if !ty.is_null() && !T::compatible(&ty) {
                 return Err(Error::ColumnDecode {
-                    index: format!("{:?}", index),
+                    index: format!("{index:?}"),
                     source: mismatched_types::<Self::Database, T>(&ty),
                 });
             }
         }
 
         T::decode(value).map_err(|source| Error::ColumnDecode {
-            index: format!("{:?}", index),
+            index: format!("{index:?}"),
             source,
         })
     }
@@ -158,7 +158,7 @@ pub trait Row: Unpin + Send + Sync + 'static {
         let value = self.try_get_raw(&index)?;
 
         T::decode(value).map_err(|source| Error::ColumnDecode {
-            index: format!("{:?}", index),
+            index: format!("{index:?}"),
             source,
         })
     }
diff --git a/sqlx-core/src/testing/fixtures.rs b/sqlx-core/src/testing/fixtures.rs
index 2cb7043eb0..fc44e5bf75 100644
--- a/sqlx-core/src/testing/fixtures.rs
+++ b/sqlx-core/src/testing/fixtures.rs
@@ -128,7 +128,7 @@ where
                         continue;
                     }
 
-                    query.push(format_args!("INSERT INTO {} (", table));
+                    query.push(format_args!("INSERT INTO {table} ("));
 
                     let mut separated = query.separated(", ");
 
diff --git a/sqlx-core/src/testing/mod.rs b/sqlx-core/src/testing/mod.rs
index 1725f9eca1..d82d1a3616 100644
--- a/sqlx-core/src/testing/mod.rs
+++ b/sqlx-core/src/testing/mod.rs
@@ -191,7 +191,7 @@ where
             .is_err();
 
         if close_timed_out {
-            eprintln!("test {} held onto Pool after exiting", test_path);
+            eprintln!("test {test_path} held onto Pool after exiting");
         }
 
         res
diff --git a/sqlx-core/src/transaction.rs b/sqlx-core/src/transaction.rs
index 0dfd50a4d4..0516b6adc3 100644
--- a/sqlx-core/src/transaction.rs
+++ b/sqlx-core/src/transaction.rs
@@ -244,7 +244,7 @@ pub fn begin_ansi_transaction_sql(depth: usize) -> Cow<'static, str> {
     if depth == 0 {
         Cow::Borrowed("BEGIN")
     } else {
-        Cow::Owned(format!("SAVEPOINT _sqlx_savepoint_{}", depth))
+        Cow::Owned(format!("SAVEPOINT _sqlx_savepoint_{depth}"))
     }
 }
 
diff --git a/sqlx-macros-core/src/query/args.rs b/sqlx-macros-core/src/query/args.rs
index 1a5b061e8d..ce5a55f16c 100644
--- a/sqlx-macros-core/src/query/args.rs
+++ b/sqlx-macros-core/src/query/args.rs
@@ -70,7 +70,7 @@ pub fn quote_args<DB: DatabaseExt>(
                                     }
                                 })?
                                 .parse::<TokenStream>()
-                                .map_err(|_| format!("Rust type mapping for {} not parsable", param_ty))?
+                                .map_err(|_| format!("Rust type mapping for {param_ty} not parsable"))?
 
                         }
                     };
diff --git a/sqlx-macros-core/src/query/data.rs b/sqlx-macros-core/src/query/data.rs
index 207f97b7ca..273ccdd14d 100644
--- a/sqlx-macros-core/src/query/data.rs
+++ b/sqlx-macros-core/src/query/data.rs
@@ -15,7 +15,7 @@ use sqlx_core::describe::Describe;
 use crate::database::DatabaseExt;
 
 #[derive(serde::Serialize)]
-#[serde(bound(serialize = "Describe<DB>: serde::Serialize",))]
+#[serde(bound(serialize = "Describe<DB>: serde::Serialize"))]
 #[derive(Debug)]
 pub struct QueryData<DB: Database> {
     db_name: SerializeDbName<DB>,
@@ -161,20 +161,20 @@ where
         // Use a temp directory inside the workspace to avoid potential issues
         // with persisting the file across filesystems.
         let mut tmp_file = tempfile::NamedTempFile::new_in(tmp_dir)
-            .map_err(|err| format!("failed to create query file: {:?}", err))?;
+            .map_err(|err| format!("failed to create query file: {err:?}"))?;
 
         serde_json::to_writer_pretty(tmp_file.as_file_mut(), self)
-            .map_err(|err| format!("failed to serialize query data to file: {:?}", err))?;
+            .map_err(|err| format!("failed to serialize query data to file: {err:?}"))?;
         // Ensure there is a newline at the end of the JSON file to avoid accidental modification by IDE
         // and make github diff tool happier
         tmp_file
             .as_file_mut()
             .write_all(b"\n")
-            .map_err(|err| format!("failed to append a newline to file: {:?}", err))?;
+            .map_err(|err| format!("failed to append a newline to file: {err:?}"))?;
 
         tmp_file
             .persist(dir.as_ref().join(format!("query-{}.json", self.hash)))
-            .map_err(|err| format!("failed to move query file: {:?}", err))?;
+            .map_err(|err| format!("failed to move query file: {err:?}"))?;
 
         Ok(())
     }
diff --git a/sqlx-macros-core/src/query/input.rs b/sqlx-macros-core/src/query/input.rs
index 4711c65078..63e35ec77d 100644
--- a/sqlx-macros-core/src/query/input.rs
+++ b/sqlx-macros-core/src/query/input.rs
@@ -83,7 +83,7 @@ impl Parse for QueryMacroInput {
                 let lit_bool = input.parse::<LitBool>()?;
                 checked = lit_bool.value;
             } else {
-                let message = format!("unexpected input key: {}", key);
+                let message = format!("unexpected input key: {key}");
                 return Err(syn::Error::new_spanned(key, message));
             }
 
diff --git a/sqlx-macros-core/src/query/mod.rs b/sqlx-macros-core/src/query/mod.rs
index e1148f59f7..4b9ad30558 100644
--- a/sqlx-macros-core/src/query/mod.rs
+++ b/sqlx-macros-core/src/query/mod.rs
@@ -121,7 +121,7 @@ static METADATA: Lazy<Metadata> = Lazy::new(|| {
     let env_path = if env_path.exists() {
         let res = dotenvy::from_path(&env_path);
         if let Err(e) = res {
-            panic!("failed to load environment from {:?}, {}", env_path, e);
+            panic!("failed to load environment from {env_path:?}, {e}");
         }
 
         Some(env_path)
@@ -373,16 +373,15 @@ where
                 Err(e) => {
                     if e.kind() != io::ErrorKind::NotFound {
                         // Can't obtain information about .sqlx
-                        return Err(format!("{}: {}", e, dir).into());
+                        return Err(format!("{e}: {dir}").into());
                     }
                     // .sqlx doesn't exist.
-                    return Err(format!("sqlx offline path does not exist: {}", dir).into());
+                    return Err(format!("sqlx offline path does not exist: {dir}").into());
                 }
                 Ok(meta) => {
                     if !meta.is_dir() {
                         return Err(format!(
-                            "sqlx offline path exists, but is not a directory: {}",
-                            dir
+                            "sqlx offline path exists, but is not a directory: {dir}"
                         )
                         .into());
                     }
diff --git a/sqlx-macros-core/src/query/output.rs b/sqlx-macros-core/src/query/output.rs
index 684c101ce0..d0d837c9ee 100644
--- a/sqlx-macros-core/src/query/output.rs
+++ b/sqlx-macros-core/src/query/output.rs
@@ -327,5 +327,5 @@ fn parse_ident(name: &str) -> crate::Result<Ident> {
         }
     }
 
-    Err(format!("{:?} is not a valid Rust identifier", name).into())
+    Err(format!("{name:?} is not a valid Rust identifier").into())
 }
diff --git a/sqlx-macros-core/src/test_attr.rs b/sqlx-macros-core/src/test_attr.rs
index 9f25d5661f..d46c4f92b1 100644
--- a/sqlx-macros-core/src/test_attr.rs
+++ b/sqlx-macros-core/src/test_attr.rs
@@ -1,4 +1,4 @@
-use proc_macro2::{Span, TokenStream};
+use proc_macro2::TokenStream;
 use quote::quote;
 use syn::LitStr;
 
diff --git a/sqlx-mysql/src/any.rs b/sqlx-mysql/src/any.rs
index 247b069690..404c408a9e 100644
--- a/sqlx-mysql/src/any.rs
+++ b/sqlx-mysql/src/any.rs
@@ -155,7 +155,7 @@ impl<'a> TryFrom<&'a MySqlTypeInfo> for AnyTypeInfo {
                 }
                 _ => {
                     return Err(sqlx_core::Error::AnyDriverError(
-                        format!("Any driver does not support MySql type {:?}", type_info).into(),
+                        format!("Any driver does not support MySql type {type_info:?}").into(),
                     ))
                 }
             },
diff --git a/sqlx-mysql/src/collation.rs b/sqlx-mysql/src/collation.rs
index a0073b15b9..46a3a3f90c 100644
--- a/sqlx-mysql/src/collation.rs
+++ b/sqlx-mysql/src/collation.rs
@@ -190,7 +190,7 @@ impl FromStr for CharSet {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unsupported MySQL charset: {}", char_set).into(),
+                    format!("unsupported MySQL charset: {char_set}").into(),
                 ));
             }
         })
@@ -892,7 +892,7 @@ impl FromStr for Collation {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unsupported MySQL collation: {}", collation).into(),
+                    format!("unsupported MySQL collation: {collation}").into(),
                 ));
             }
         })
diff --git a/sqlx-mysql/src/migrate.rs b/sqlx-mysql/src/migrate.rs
index 0e08226ec5..dac2753e5f 100644
--- a/sqlx-mysql/src/migrate.rs
+++ b/sqlx-mysql/src/migrate.rs
@@ -37,7 +37,7 @@ impl MigrateDatabase for MySql {
             let mut conn = options.connect().await?;
 
             let _ = conn
-                .execute(&*format!("CREATE DATABASE `{}`", database))
+                .execute(&*format!("CREATE DATABASE `{database}`"))
                 .await?;
 
             Ok(())
@@ -66,7 +66,7 @@ impl MigrateDatabase for MySql {
             let mut conn = options.connect().await?;
 
             let _ = conn
-                .execute(&*format!("DROP DATABASE IF EXISTS `{}`", database,))
+                .execute(&*format!("DROP DATABASE IF EXISTS `{database}`"))
                 .await?;
 
             Ok(())
diff --git a/sqlx-mysql/src/options/ssl_mode.rs b/sqlx-mysql/src/options/ssl_mode.rs
index a9abf08441..53e0c3b0d9 100644
--- a/sqlx-mysql/src/options/ssl_mode.rs
+++ b/sqlx-mysql/src/options/ssl_mode.rs
@@ -49,7 +49,7 @@ impl FromStr for MySqlSslMode {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unknown value {:?} for `ssl_mode`", s).into(),
+                    format!("unknown value {s:?} for `ssl_mode`").into(),
                 ));
             }
         })
diff --git a/sqlx-mysql/src/testing/mod.rs b/sqlx-mysql/src/testing/mod.rs
index 2840cc7ec3..0f7e27ada3 100644
--- a/sqlx-mysql/src/testing/mod.rs
+++ b/sqlx-mysql/src/testing/mod.rs
@@ -43,7 +43,7 @@ impl TestSupport for MySql {
 
             let db_id = db_id(db_name);
 
-            conn.execute(&format!("drop database if exists {};", db_name)[..])
+            conn.execute(&format!("drop database if exists {db_name};")[..])
                 .await?;
 
             query("delete from _sqlx_test_databases where db_id = ?")
@@ -152,10 +152,10 @@ async fn test_context(args: &TestArgs) -> Result<TestContext<MySql>, Error> {
 
     let new_db_name = db_name(new_db_id);
 
-    conn.execute(&format!("create database {}", new_db_name)[..])
+    conn.execute(&format!("create database {new_db_name}")[..])
         .await?;
 
-    eprintln!("created database {}", new_db_name);
+    eprintln!("created database {new_db_name}");
 
     Ok(TestContext {
         pool_opts: PoolOptions::new()
@@ -197,14 +197,14 @@ async fn do_cleanup(conn: &mut MySqlConnection, created_before: Duration) -> Res
 
         let db_name = db_name(db_id);
 
-        writeln!(command, "drop database if exists {}", db_name).ok();
+        writeln!(command, "drop database if exists {db_name}").ok();
         match conn.execute(&*command).await {
             Ok(_deleted) => {
                 deleted_db_ids.push(db_id);
             }
             // Assume a database error just means the DB is still in use.
             Err(Error::Database(dbe)) => {
-                eprintln!("could not clean test database {:?}: {}", db_id, dbe)
+                eprintln!("could not clean test database {db_id:?}: {dbe}")
             }
             // Bubble up other errors
             Err(e) => return Err(e),
@@ -227,13 +227,13 @@ async fn do_cleanup(conn: &mut MySqlConnection, created_before: Duration) -> Res
 }
 
 fn db_name(id: u64) -> String {
-    format!("_sqlx_test_database_{}", id)
+    format!("_sqlx_test_database_{id}")
 }
 
 fn db_id(name: &str) -> u64 {
     name.trim_start_matches("_sqlx_test_database_")
         .parse()
-        .unwrap_or_else(|_1| panic!("failed to parse ID from database name {:?}", name))
+        .unwrap_or_else(|_1| panic!("failed to parse ID from database name {name:?}"))
 }
 
 #[test]
diff --git a/sqlx-mysql/src/types/chrono.rs b/sqlx-mysql/src/types/chrono.rs
index 656c5bce91..6a6123b418 100644
--- a/sqlx-mysql/src/types/chrono.rs
+++ b/sqlx-mysql/src/types/chrono.rs
@@ -236,7 +236,7 @@ impl<'r> Decode<'r, MySql> for NaiveDateTime {
 fn encode_date(date: &NaiveDate, buf: &mut Vec<u8>) {
     // MySQL supports years from 1000 - 9999
     let year = u16::try_from(date.year())
-        .unwrap_or_else(|_| panic!("NaiveDateTime out of range for Mysql: {}", date));
+        .unwrap_or_else(|_| panic!("NaiveDateTime out of range for Mysql: {date}"));
 
     buf.extend_from_slice(&year.to_le_bytes());
     buf.push(date.month() as u8);
diff --git a/sqlx-mysql/src/types/time.rs b/sqlx-mysql/src/types/time.rs
index 98d7b0fde8..8a3c06eb96 100644
--- a/sqlx-mysql/src/types/time.rs
+++ b/sqlx-mysql/src/types/time.rs
@@ -223,7 +223,7 @@ impl<'r> Decode<'r, MySql> for PrimitiveDateTime {
 fn encode_date(date: &Date, buf: &mut Vec<u8>) {
     // MySQL supports years from 1000 - 9999
     let year = u16::try_from(date.year())
-        .unwrap_or_else(|_| panic!("Date out of range for Mysql: {}", date));
+        .unwrap_or_else(|_| panic!("Date out of range for Mysql: {date}"));
 
     buf.extend_from_slice(&year.to_le_bytes());
     buf.push(date.month().into());
@@ -268,5 +268,5 @@ fn decode_time(len: u8, mut buf: &[u8]) -> Result<Time, BoxDynError> {
     };
 
     Time::from_hms_micro(hour, minute, seconds, micros as u32)
-        .map_err(|e| format!("Time out of range for MySQL: {}", e).into())
+        .map_err(|e| format!("Time out of range for MySQL: {e}").into())
 }
diff --git a/sqlx-postgres/src/advisory_lock.rs b/sqlx-postgres/src/advisory_lock.rs
index f5684d41f9..928524edea 100644
--- a/sqlx-postgres/src/advisory_lock.rs
+++ b/sqlx-postgres/src/advisory_lock.rs
@@ -302,9 +302,9 @@ impl PgAdvisoryLock {
 
     fn get_release_query(&self) -> &str {
         self.release_query.get_or_init(|| match &self.key {
-            PgAdvisoryLockKey::BigInt(key) => format!("SELECT pg_advisory_unlock({})", key),
+            PgAdvisoryLockKey::BigInt(key) => format!("SELECT pg_advisory_unlock({key})"),
             PgAdvisoryLockKey::IntPair(key1, key2) => {
-                format!("SELECT pg_advisory_unlock({}, {})", key1, key2)
+                format!("SELECT pg_advisory_unlock({key1}, {key2})")
             }
         })
     }
diff --git a/sqlx-postgres/src/any.rs b/sqlx-postgres/src/any.rs
index 4d1c593dff..8cb6882e1d 100644
--- a/sqlx-postgres/src/any.rs
+++ b/sqlx-postgres/src/any.rs
@@ -143,8 +143,7 @@ impl AnyConnectionBackend for PgConnection {
                             AnyTypeInfo::try_from(type_info).map_err(|_| {
                                 sqlx_core::Error::AnyDriverError(
                                     format!(
-                                        "Any driver does not support type {} of parameter {}",
-                                        type_info, i
+                                        "Any driver does not support type {type_info} of parameter {i}"
                                     )
                                     .into(),
                                 )
@@ -181,11 +180,7 @@ impl<'a> TryFrom<&'a PgTypeInfo> for AnyTypeInfo {
                 PgType::Text => AnyTypeInfoKind::Text,
                 _ => {
                     return Err(sqlx_core::Error::AnyDriverError(
-                        format!(
-                            "Any driver does not support the Postgres type {:?}",
-                            pg_type
-                        )
-                        .into(),
+                        format!("Any driver does not support the Postgres type {pg_type:?}").into(),
                     ))
                 }
             },
diff --git a/sqlx-postgres/src/connection/sasl.rs b/sqlx-postgres/src/connection/sasl.rs
index 46e24d2e16..e82df42582 100644
--- a/sqlx-postgres/src/connection/sasl.rs
+++ b/sqlx-postgres/src/connection/sasl.rs
@@ -50,7 +50,7 @@ pub(crate) async fn authenticate(
     }
 
     // channel-binding = "c=" base64
-    let mut channel_binding = format!("{}=", CHANNEL_ATTR);
+    let mut channel_binding = format!("{CHANNEL_ATTR}=");
     BASE64_STANDARD.encode_string(GS2_HEADER, &mut channel_binding);
 
     // "n=" saslname ;; Usernames are prepared using SASLprep.
@@ -65,14 +65,9 @@ pub(crate) async fn authenticate(
     let nonce = gen_nonce();
 
     // client-first-message-bare = [reserved-mext ","] username "," nonce ["," extensions]
-    let client_first_message_bare =
-        format!("{username},{nonce}", username = username, nonce = nonce);
+    let client_first_message_bare = format!("{username},{nonce}");
 
-    let client_first_message = format!(
-        "{gs2_header}{client_first_message_bare}",
-        gs2_header = GS2_HEADER,
-        client_first_message_bare = client_first_message_bare
-    );
+    let client_first_message = format!("{GS2_HEADER}{client_first_message_bare}");
 
     stream
         .send(SaslInitialResponse {
@@ -147,11 +142,7 @@ pub(crate) async fn authenticate(
     mac.update(&auth_message.as_bytes());
 
     // client-final-message = client-final-message-without-proof "," proof
-    let mut client_final_message = format!(
-        "{client_final_message_wo_proof},{client_proof_attr}=",
-        client_final_message_wo_proof = client_final_message_wo_proof,
-        client_proof_attr = CLIENT_PROOF_ATTR,
-    );
+    let mut client_final_message = format!("{client_final_message_wo_proof},{CLIENT_PROOF_ATTR}=");
     BASE64_STANDARD.encode_string(client_proof, &mut client_final_message);
 
     stream.send(SaslResponse(&client_final_message)).await?;
@@ -194,7 +185,7 @@ fn gen_nonce() -> String {
         .collect();
 
     rng.gen_range(32..128);
-    format!("{}={}", NONCE_ATTR, nonce)
+    format!("{NONCE_ATTR}={nonce}")
 }
 
 // Hi(str, salt, i):
diff --git a/sqlx-postgres/src/options/mod.rs b/sqlx-postgres/src/options/mod.rs
index bd22f84f07..581880a302 100644
--- a/sqlx-postgres/src/options/mod.rs
+++ b/sqlx-postgres/src/options/mod.rs
@@ -476,7 +476,7 @@ impl PgConnectOptions {
                 options_str.push(' ');
             }
 
-            write!(options_str, "-c {}={}", k, v).expect("failed to write an option to the string");
+            write!(options_str, "-c {k}={v}").expect("failed to write an option to the string");
         }
         self
     }
@@ -500,7 +500,7 @@ impl PgConnectOptions {
 
 fn default_host(port: u16) -> String {
     // try to check for the existence of a unix socket and uses that
-    let socket = format!(".s.PGSQL.{}", port);
+    let socket = format!(".s.PGSQL.{port}");
     let candidates = [
         "/var/run/postgresql", // Debian
         "/private/tmp",        // OSX (homebrew)
diff --git a/sqlx-postgres/src/options/pgpass.rs b/sqlx-postgres/src/options/pgpass.rs
index 8ddb781e56..0532d9e67b 100644
--- a/sqlx-postgres/src/options/pgpass.rs
+++ b/sqlx-postgres/src/options/pgpass.rs
@@ -55,7 +55,7 @@ fn load_password_from_file(
         if mode & 0o77 != 0 {
             tracing::warn!(
                 path = %path.to_string_lossy(),
-                permissions = format!("{:o}", mode),
+                permissions = format!("{mode:o}"),
                 "Ignoring path. Permissions are not strict enough",
             );
             return None;
diff --git a/sqlx-postgres/src/options/ssl_mode.rs b/sqlx-postgres/src/options/ssl_mode.rs
index 936e862d0f..60125e4670 100644
--- a/sqlx-postgres/src/options/ssl_mode.rs
+++ b/sqlx-postgres/src/options/ssl_mode.rs
@@ -48,7 +48,7 @@ impl FromStr for PgSslMode {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unknown value {:?} for `ssl_mode`", s).into(),
+                    format!("unknown value {s:?} for `ssl_mode`").into(),
                 ));
             }
         })
diff --git a/sqlx-postgres/src/testing/mod.rs b/sqlx-postgres/src/testing/mod.rs
index a6486baaeb..1dfacecbe4 100644
--- a/sqlx-postgres/src/testing/mod.rs
+++ b/sqlx-postgres/src/testing/mod.rs
@@ -40,7 +40,7 @@ impl TestSupport for Postgres {
                 .acquire()
                 .await?;
 
-            conn.execute(&format!("drop database if exists {0:?};", db_name)[..])
+            conn.execute(&format!("drop database if exists {db_name:?};")[..])
                 .await?;
 
             query("delete from _sqlx_test.databases where db_name = $1")
@@ -161,7 +161,7 @@ async fn test_context(args: &TestArgs) -> Result<TestContext<Postgres>, Error> {
     .fetch_one(&mut *conn)
     .await?;
 
-    conn.execute(&format!("create database {:?}", new_db_name)[..])
+    conn.execute(&format!("create database {new_db_name:?}")[..])
         .await?;
 
     Ok(TestContext {
@@ -204,14 +204,14 @@ async fn do_cleanup(conn: &mut PgConnection, created_before: Duration) -> Result
 
     for db_name in delete_db_names {
         command.clear();
-        writeln!(command, "drop database if exists {:?};", db_name).ok();
+        writeln!(command, "drop database if exists {db_name:?};").ok();
         match conn.execute(&*command).await {
             Ok(_deleted) => {
                 deleted_db_names.push(db_name);
             }
             // Assume a database error just means the DB is still in use.
             Err(Error::Database(dbe)) => {
-                eprintln!("could not clean test database {:?}: {}", db_name, dbe)
+                eprintln!("could not clean test database {db_name:?}: {dbe}")
             }
             // Bubble up other errors
             Err(e) => return Err(e),
diff --git a/sqlx-postgres/src/type_info.rs b/sqlx-postgres/src/type_info.rs
index b44bded580..e4ca317ffb 100644
--- a/sqlx-postgres/src/type_info.rs
+++ b/sqlx-postgres/src/type_info.rs
@@ -768,7 +768,7 @@ impl PgType {
                 unreachable!("(bug) use of unresolved type declaration [oid={}]", oid.0);
             }
             PgType::DeclareWithName(name) => {
-                unreachable!("(bug) use of unresolved type declaration [name={}]", name);
+                unreachable!("(bug) use of unresolved type declaration [name={name}]");
             }
         }
     }
@@ -887,7 +887,7 @@ impl PgType {
                 unreachable!("(bug) use of unresolved type declaration [oid={}]", oid.0);
             }
             PgType::DeclareWithName(name) => {
-                unreachable!("(bug) use of unresolved type declaration [name={}]", name);
+                unreachable!("(bug) use of unresolved type declaration [name={name}]");
             }
         }
     }
diff --git a/sqlx-postgres/src/types/array.rs b/sqlx-postgres/src/types/array.rs
index 124da53c37..cbe760a2ec 100644
--- a/sqlx-postgres/src/types/array.rs
+++ b/sqlx-postgres/src/types/array.rs
@@ -196,7 +196,7 @@ where
                 }
 
                 if ndim != 1 {
-                    return Err(format!("encountered an array of {} dimensions; only one-dimensional arrays are supported", ndim).into());
+                    return Err(format!("encountered an array of {ndim} dimensions; only one-dimensional arrays are supported").into());
                 }
 
                 // appears to have been used in the past to communicate potential NULLS
@@ -222,7 +222,7 @@ where
                 let lower = buf.get_i32();
 
                 if lower != 1 {
-                    return Err(format!("encountered an array with a lower bound of {} in the first dimension; only arrays starting at one are supported", lower).into());
+                    return Err(format!("encountered an array with a lower bound of {lower} in the first dimension; only arrays starting at one are supported").into());
                 }
 
                 let mut elements = Vec::with_capacity(len as usize);
diff --git a/sqlx-postgres/src/types/bool.rs b/sqlx-postgres/src/types/bool.rs
index e55470bfb5..ec75381198 100644
--- a/sqlx-postgres/src/types/bool.rs
+++ b/sqlx-postgres/src/types/bool.rs
@@ -34,7 +34,7 @@ impl Decode<'_, Postgres> for bool {
                 "f" => false,
 
                 s => {
-                    return Err(format!("unexpected value {:?} for boolean", s).into());
+                    return Err(format!("unexpected value {s:?} for boolean").into());
                 }
             },
         })
diff --git a/sqlx-postgres/src/types/chrono/datetime.rs b/sqlx-postgres/src/types/chrono/datetime.rs
index 1860fbfeee..72aea4945d 100644
--- a/sqlx-postgres/src/types/chrono/datetime.rs
+++ b/sqlx-postgres/src/types/chrono/datetime.rs
@@ -38,7 +38,7 @@ impl Encode<'_, Postgres> for NaiveDateTime {
         // TIMESTAMP is encoded as the microseconds since the epoch
         let us = (*self - postgres_epoch_datetime())
             .num_microseconds()
-            .unwrap_or_else(|| panic!("NaiveDateTime out of range for Postgres: {:?}", self));
+            .unwrap_or_else(|| panic!("NaiveDateTime out of range for Postgres: {self:?}"));
 
         Encode::<Postgres>::encode(&us, buf)
     }
diff --git a/sqlx-postgres/src/types/ipnetwork.rs b/sqlx-postgres/src/types/ipnetwork.rs
index e4d15ff681..539c88ed66 100644
--- a/sqlx-postgres/src/types/ipnetwork.rs
+++ b/sqlx-postgres/src/types/ipnetwork.rs
@@ -112,7 +112,7 @@ impl Decode<'_, Postgres> for IpNetwork {
                 }
 
                 _ => {
-                    return Err(format!("unknown ip family {}", family).into());
+                    return Err(format!("unknown ip family {family}").into());
                 }
             }
         }
diff --git a/sqlx-postgres/src/types/lquery.rs b/sqlx-postgres/src/types/lquery.rs
index 8a83f4b4ef..79e4d162fa 100644
--- a/sqlx-postgres/src/types/lquery.rs
+++ b/sqlx-postgres/src/types/lquery.rs
@@ -114,9 +114,9 @@ impl Display for PgLQuery {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         let mut iter = self.levels.iter();
         if let Some(label) = iter.next() {
-            write!(f, "{}", label)?;
+            write!(f, "{label}")?;
             for label in iter {
-                write!(f, ".{}", label)?;
+                write!(f, ".{label}")?;
             }
         }
         Ok(())
@@ -141,7 +141,7 @@ impl Type<Postgres> for PgLQuery {
 impl Encode<'_, Postgres> for PgLQuery {
     fn encode_by_ref(&self, buf: &mut PgArgumentBuffer) -> IsNull {
         buf.extend(1i8.to_le_bytes());
-        write!(buf, "{}", self)
+        write!(buf, "{self}")
             .expect("Display implementation panicked while writing to PgArgumentBuffer");
 
         IsNull::No
@@ -288,7 +288,7 @@ fn write_variants(f: &mut Formatter<'_>, variants: &[PgLQueryVariant], not: bool
     if let Some(variant) = iter.next() {
         write!(f, "{}{}", if not { "!" } else { "" }, variant)?;
         for variant in iter {
-            write!(f, ".{}", variant)?;
+            write!(f, ".{variant}")?;
         }
     }
     Ok(())
@@ -299,13 +299,13 @@ impl Display for PgLQueryLevel {
         match self {
             PgLQueryLevel::Star(Some(at_least), Some(at_most)) => {
                 if at_least == at_most {
-                    write!(f, "*{{{}}}", at_least)
+                    write!(f, "*{{{at_least}}}")
                 } else {
-                    write!(f, "*{{{},{}}}", at_least, at_most)
+                    write!(f, "*{{{at_least},{at_most}}}")
                 }
             }
-            PgLQueryLevel::Star(Some(at_least), _) => write!(f, "*{{{},}}", at_least),
-            PgLQueryLevel::Star(_, Some(at_most)) => write!(f, "*{{,{}}}", at_most),
+            PgLQueryLevel::Star(Some(at_least), _) => write!(f, "*{{{at_least},}}"),
+            PgLQueryLevel::Star(_, Some(at_most)) => write!(f, "*{{,{at_most}}}"),
             PgLQueryLevel::Star(_, _) => write!(f, "*"),
             PgLQueryLevel::NonStar(variants) => write_variants(f, &variants, false),
             PgLQueryLevel::NotNonStar(variants) => write_variants(f, &variants, true),
diff --git a/sqlx-postgres/src/types/ltree.rs b/sqlx-postgres/src/types/ltree.rs
index db6296cd35..7ddfb39802 100644
--- a/sqlx-postgres/src/types/ltree.rs
+++ b/sqlx-postgres/src/types/ltree.rs
@@ -150,9 +150,9 @@ impl Display for PgLTree {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         let mut iter = self.labels.iter();
         if let Some(label) = iter.next() {
-            write!(f, "{}", label)?;
+            write!(f, "{label}")?;
             for label in iter {
-                write!(f, ".{}", label)?;
+                write!(f, ".{label}")?;
             }
         }
         Ok(())
@@ -183,7 +183,7 @@ impl PgHasArrayType for PgLTree {
 impl Encode<'_, Postgres> for PgLTree {
     fn encode_by_ref(&self, buf: &mut PgArgumentBuffer) -> IsNull {
         buf.extend(1i8.to_le_bytes());
-        write!(buf, "{}", self)
+        write!(buf, "{self}")
             .expect("Display implementation panicked while writing to PgArgumentBuffer");
 
         IsNull::No
diff --git a/sqlx-postgres/src/types/numeric.rs b/sqlx-postgres/src/types/numeric.rs
index 659699c262..b281de46fb 100644
--- a/sqlx-postgres/src/types/numeric.rs
+++ b/sqlx-postgres/src/types/numeric.rs
@@ -69,7 +69,7 @@ impl PgNumericSign {
 
             SIGN_NAN => unreachable!("sign value for NaN passed to PgNumericSign"),
 
-            _ => Err(format!("invalid value for PgNumericSign: {:#04X}", val).into()),
+            _ => Err(format!("invalid value for PgNumericSign: {val:#04X}").into()),
         }
     }
 }
diff --git a/sqlx-postgres/src/types/range.rs b/sqlx-postgres/src/types/range.rs
index 2152808dc8..ea34577069 100644
--- a/sqlx-postgres/src/types/range.rs
+++ b/sqlx-postgres/src/types/range.rs
@@ -480,8 +480,7 @@ fn parse_bound<T>(ch: char, value: Option<T>) -> Result<Bound<T>, BoxDynError> {
 
             _ => {
                 return Err(format!(
-                    "expected `(`, ')', '[', or `]` but found `{}` for range literal",
-                    ch
+                    "expected `(`, ')', '[', or `]` but found `{ch}` for range literal"
                 )
                 .into());
             }
@@ -498,14 +497,14 @@ where
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         match &self.start {
             Bound::Unbounded => f.write_str("(,")?,
-            Bound::Excluded(v) => write!(f, "({},", v)?,
-            Bound::Included(v) => write!(f, "[{},", v)?,
+            Bound::Excluded(v) => write!(f, "({v},")?,
+            Bound::Included(v) => write!(f, "[{v},")?,
         }
 
         match &self.end {
             Bound::Unbounded => f.write_str(")")?,
-            Bound::Excluded(v) => write!(f, "{})", v)?,
-            Bound::Included(v) => write!(f, "{}]", v)?,
+            Bound::Excluded(v) => write!(f, "{v})")?,
+            Bound::Included(v) => write!(f, "{v}]")?,
         }
 
         Ok(())
diff --git a/sqlx-postgres/src/types/time/datetime.rs b/sqlx-postgres/src/types/time/datetime.rs
index 2d794e5931..90109078d8 100644
--- a/sqlx-postgres/src/types/time/datetime.rs
+++ b/sqlx-postgres/src/types/time/datetime.rs
@@ -62,7 +62,7 @@ impl<'r> Decode<'r, Postgres> for PrimitiveDateTime {
                 let s = if s.contains('.') {
                     Cow::Borrowed(s)
                 } else {
-                    Cow::Owned(format!("{}.0", s))
+                    Cow::Owned(format!("{s}.0"))
                 };
 
                 // Contains a time-zone specifier
diff --git a/sqlx-sqlite/src/any.rs b/sqlx-sqlite/src/any.rs
index 3bb22a3396..dc84f66598 100644
--- a/sqlx-sqlite/src/any.rs
+++ b/sqlx-sqlite/src/any.rs
@@ -148,11 +148,8 @@ impl<'a> TryFrom<&'a SqliteTypeInfo> for AnyTypeInfo {
                 DataType::Text => AnyTypeInfoKind::Text,
                 _ => {
                     return Err(sqlx_core::Error::AnyDriverError(
-                        format!(
-                            "Any driver does not support the SQLite type {:?}",
-                            sqlite_type
-                        )
-                        .into(),
+                        format!("Any driver does not support the SQLite type {sqlite_type:?}")
+                            .into(),
                     ))
                 }
             },
@@ -214,7 +211,7 @@ fn map_arguments(args: AnyArguments<'_>) -> SqliteArguments<'_> {
                 AnyValueKind::Text(t) => SqliteArgumentValue::Text(t),
                 AnyValueKind::Blob(b) => SqliteArgumentValue::Blob(b),
                 // AnyValueKind is `#[non_exhaustive]` but we should have covered everything
-                _ => unreachable!("BUG: missing mapping for {:?}", val),
+                _ => unreachable!("BUG: missing mapping for {val:?}"),
             })
             .collect(),
     }
diff --git a/sqlx-sqlite/src/connection/establish.rs b/sqlx-sqlite/src/connection/establish.rs
index 91a3aff05e..36444e5e2d 100644
--- a/sqlx-sqlite/src/connection/establish.rs
+++ b/sqlx-sqlite/src/connection/establish.rs
@@ -96,7 +96,7 @@ impl EstablishParams {
         }
 
         if let Some(vfs) = &options.vfs {
-            query_params.push(format!("vfs={}", vfs))
+            query_params.push(format!("vfs={vfs}"))
         }
 
         if !query_params.is_empty() {
diff --git a/sqlx-sqlite/src/connection/explain.rs b/sqlx-sqlite/src/connection/explain.rs
index 6b8ee0ce98..cb7ee62c64 100644
--- a/sqlx-sqlite/src/connection/explain.rs
+++ b/sqlx-sqlite/src/connection/explain.rs
@@ -430,7 +430,7 @@ pub(super) fn explain(
 ) -> Result<(Vec<SqliteTypeInfo>, Vec<Option<bool>>), Error> {
     let root_block_cols = root_block_columns(conn)?;
     let program: Vec<(i64, String, i64, i64, i64, Vec<u8>)> =
-        execute::iter(conn, &format!("EXPLAIN {}", query), None, false)?
+        execute::iter(conn, &format!("EXPLAIN {query}"), None, false)?
             .filter_map(|res| res.map(|either| either.right()).transpose())
             .map(|row| FromRow::from_row(&row?))
             .collect::<Result<Vec<_>, Error>>()?;
diff --git a/sqlx-sqlite/src/connection/mod.rs b/sqlx-sqlite/src/connection/mod.rs
index f17c610264..6f6d9b0c51 100644
--- a/sqlx-sqlite/src/connection/mod.rs
+++ b/sqlx-sqlite/src/connection/mod.rs
@@ -133,7 +133,7 @@ impl Connection for SqliteConnection {
             if let OptimizeOnClose::Enabled { analysis_limit } = self.optimize_on_close {
                 let mut pragma_string = String::new();
                 if let Some(limit) = analysis_limit {
-                    write!(pragma_string, "PRAGMA analysis_limit = {}; ", limit).ok();
+                    write!(pragma_string, "PRAGMA analysis_limit = {limit}; ").ok();
                 }
                 pragma_string.push_str("PRAGMA optimize;");
                 self.execute(&*pragma_string).await?;
@@ -258,7 +258,7 @@ impl LockedSqliteHandle<'_> {
     /// The progress handler callback must not do anything that will modify the database connection that invoked
     /// the progress handler. Note that sqlite3_prepare_v2() and sqlite3_step() both modify their database connections
     /// in this context.
-    pub fn set_progress_handler<F>(&mut self, num_ops: i32, mut callback: F)
+    pub fn set_progress_handler<F>(&mut self, num_ops: i32, callback: F)
     where
         F: FnMut() -> bool + Send + 'static,
     {
diff --git a/sqlx-sqlite/src/options/auto_vacuum.rs b/sqlx-sqlite/src/options/auto_vacuum.rs
index 65d0c4613e..647c3b629a 100644
--- a/sqlx-sqlite/src/options/auto_vacuum.rs
+++ b/sqlx-sqlite/src/options/auto_vacuum.rs
@@ -35,7 +35,7 @@ impl FromStr for SqliteAutoVacuum {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unknown value {:?} for `auto_vacuum`", s).into(),
+                    format!("unknown value {s:?} for `auto_vacuum`").into(),
                 ));
             }
         })
diff --git a/sqlx-sqlite/src/options/connect.rs b/sqlx-sqlite/src/options/connect.rs
index daca2d0681..5545cfa46c 100644
--- a/sqlx-sqlite/src/options/connect.rs
+++ b/sqlx-sqlite/src/options/connect.rs
@@ -64,7 +64,7 @@ impl SqliteConnectOptions {
 
         for (key, opt_value) in &self.pragmas {
             if let Some(value) = opt_value {
-                write!(string, "PRAGMA {} = {}; ", key, value).ok();
+                write!(string, "PRAGMA {key} = {value}; ").ok();
             }
         }
 
diff --git a/sqlx-sqlite/src/options/journal_mode.rs b/sqlx-sqlite/src/options/journal_mode.rs
index d0424adbb4..c347ec7b42 100644
--- a/sqlx-sqlite/src/options/journal_mode.rs
+++ b/sqlx-sqlite/src/options/journal_mode.rs
@@ -47,7 +47,7 @@ impl FromStr for SqliteJournalMode {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unknown value {:?} for `journal_mode`", s).into(),
+                    format!("unknown value {s:?} for `journal_mode`").into(),
                 ));
             }
         })
diff --git a/sqlx-sqlite/src/options/locking_mode.rs b/sqlx-sqlite/src/options/locking_mode.rs
index 4f0900af69..fc3641b466 100644
--- a/sqlx-sqlite/src/options/locking_mode.rs
+++ b/sqlx-sqlite/src/options/locking_mode.rs
@@ -35,7 +35,7 @@ impl FromStr for SqliteLockingMode {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unknown value {:?} for `locking_mode`", s).into(),
+                    format!("unknown value {s:?} for `locking_mode`").into(),
                 ));
             }
         })
diff --git a/sqlx-sqlite/src/options/mod.rs b/sqlx-sqlite/src/options/mod.rs
index c35644f54e..33875720d4 100644
--- a/sqlx-sqlite/src/options/mod.rs
+++ b/sqlx-sqlite/src/options/mod.rs
@@ -196,7 +196,7 @@ impl SqliteConnectOptions {
             extensions: Default::default(),
             collations: Default::default(),
             serialized: false,
-            thread_name: Arc::new(DebugFn(|id| format!("sqlx-sqlite-worker-{}", id))),
+            thread_name: Arc::new(DebugFn(|id| format!("sqlx-sqlite-worker-{id}"))),
             command_channel_size: 50,
             row_channel_size: 50,
             optimize_on_close: OptimizeOnClose::Disabled,
diff --git a/sqlx-sqlite/src/options/parse.rs b/sqlx-sqlite/src/options/parse.rs
index 59bc4f999c..a2cab10b52 100644
--- a/sqlx-sqlite/src/options/parse.rs
+++ b/sqlx-sqlite/src/options/parse.rs
@@ -18,7 +18,7 @@ impl SqliteConnectOptions {
             options.in_memory = true;
             options.shared_cache = true;
             let seqno = IN_MEMORY_DB_SEQ.fetch_add(1, Ordering::Relaxed);
-            options.filename = Cow::Owned(PathBuf::from(format!("file:sqlx-in-memory-{}", seqno)));
+            options.filename = Cow::Owned(PathBuf::from(format!("file:sqlx-in-memory-{seqno}")));
         } else {
             // % decode to allow for `?` or `#` in the filename
             options.filename = Cow::Owned(
@@ -58,7 +58,7 @@ impl SqliteConnectOptions {
 
                             _ => {
                                 return Err(Error::Configuration(
-                                    format!("unknown value {:?} for `mode`", value).into(),
+                                    format!("unknown value {value:?} for `mode`").into(),
                                 ));
                             }
                         }
@@ -78,7 +78,7 @@ impl SqliteConnectOptions {
 
                         _ => {
                             return Err(Error::Configuration(
-                                format!("unknown value {:?} for `cache`", value).into(),
+                                format!("unknown value {value:?} for `cache`").into(),
                             ));
                         }
                     },
@@ -92,7 +92,7 @@ impl SqliteConnectOptions {
                         }
                         _ => {
                             return Err(Error::Configuration(
-                                format!("unknown value {:?} for `immutable`", value).into(),
+                                format!("unknown value {value:?} for `immutable`").into(),
                             ));
                         }
                     },
@@ -101,11 +101,8 @@ impl SqliteConnectOptions {
 
                     _ => {
                         return Err(Error::Configuration(
-                            format!(
-                                "unknown query parameter `{}` while parsing connection URL",
-                                key
-                            )
-                            .into(),
+                            format!("unknown query parameter `{key}` while parsing connection URL")
+                                .into(),
                         ));
                     }
                 }
diff --git a/sqlx-sqlite/src/options/synchronous.rs b/sqlx-sqlite/src/options/synchronous.rs
index cd37682d4f..eacf91a8bd 100644
--- a/sqlx-sqlite/src/options/synchronous.rs
+++ b/sqlx-sqlite/src/options/synchronous.rs
@@ -41,7 +41,7 @@ impl FromStr for SqliteSynchronous {
 
             _ => {
                 return Err(Error::Configuration(
-                    format!("unknown value {:?} for `synchronous`", s).into(),
+                    format!("unknown value {s:?} for `synchronous`").into(),
                 ));
             }
         })
diff --git a/sqlx-sqlite/src/regexp.rs b/sqlx-sqlite/src/regexp.rs
index 93f4038899..b31e214fb0 100644
--- a/sqlx-sqlite/src/regexp.rs
+++ b/sqlx-sqlite/src/regexp.rs
@@ -157,7 +157,7 @@ unsafe fn get_text_from_arg<'a>(
         match std::str::from_utf8(slice) {
             Ok(result) => Some(result),
             Err(e) => {
-                log::error!("Incoming text is not valid UTF8: {e:?}",);
+                log::error!("Incoming text is not valid UTF8: {e:?}");
                 ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
                 None
             }
@@ -190,7 +190,7 @@ mod tests {
             .unwrap();
         for i in 0..10 {
             sqlx::query("INSERT INTO test VALUES (?)")
-                .bind(format!("value {}", i))
+                .bind(format!("value {i}"))
                 .execute(&mut conn)
                 .await
                 .unwrap();
diff --git a/sqlx-sqlite/src/type_info.rs b/sqlx-sqlite/src/type_info.rs
index 6e01507f3e..9c95b5146e 100644
--- a/sqlx-sqlite/src/type_info.rs
+++ b/sqlx-sqlite/src/type_info.rs
@@ -73,7 +73,7 @@ impl DataType {
             SQLITE_TEXT => DataType::Text,
 
             // https://sqlite.org/c3ref/c_blob.html
-            _ => panic!("unknown data type code {}", code),
+            _ => panic!("unknown data type code {code}"),
         }
     }
 }
@@ -104,7 +104,7 @@ impl FromStr for DataType {
             _ if s.contains("real") || s.contains("floa") || s.contains("doub") => DataType::Float,
 
             _ => {
-                return Err(format!("unknown type: `{}`", s).into());
+                return Err(format!("unknown type: `{s}`").into());
             }
         })
     }
diff --git a/sqlx-sqlite/src/types/chrono.rs b/sqlx-sqlite/src/types/chrono.rs
index 3632a17099..7b338aa214 100644
--- a/sqlx-sqlite/src/types/chrono.rs
+++ b/sqlx-sqlite/src/types/chrono.rs
@@ -201,6 +201,6 @@ impl<'r> Decode<'r, Sqlite> for NaiveTime {
             }
         }
 
-        Err(format!("invalid time: {}", value).into())
+        Err(format!("invalid time: {value}").into())
     }
 }
diff --git a/sqlx-sqlite/src/types/time.rs b/sqlx-sqlite/src/types/time.rs
index b25d7c7258..efd546213f 100644
--- a/sqlx-sqlite/src/types/time.rs
+++ b/sqlx-sqlite/src/types/time.rs
@@ -115,7 +115,7 @@ impl<'r> Decode<'r, Sqlite> for Time {
             }
         }
 
-        Err(format!("invalid time: {}", value).into())
+        Err(format!("invalid time: {value}").into())
     }
 }
 
diff --git a/src/macros/mod.rs b/src/macros/mod.rs
index 71e7696778..48ac63e852 100644
--- a/src/macros/mod.rs
+++ b/src/macros/mod.rs
@@ -18,7 +18,7 @@
 ///     .await?;
 ///
 /// // anonymous struct has `#[derive(Debug)]` for convenience
-/// println!("{:?}", account);
+/// println!("{account:?}");
 /// println!("{}: {}", account.id, account.name);
 ///
 /// # Ok(())
@@ -86,7 +86,7 @@
 ///     .fetch_one(&mut conn)
 ///     .await?;
 ///
-/// println!("{:?}", account);
+/// println!("{account:?}");
 /// println!("{}: {}", account.id, account.name);
 /// # Ok(())
 /// # }
@@ -369,7 +369,7 @@ macro_rules! query_unchecked (
 ///     .fetch_one(&mut conn)
 ///     .await?;
 ///
-/// println!("{:?}", account);
+/// println!("{account:?}");
 /// println!("{}: {}", account.id, account.name);
 ///
 /// # Ok(())
@@ -452,7 +452,7 @@ macro_rules! query_file_unchecked (
 ///     .fetch_one(&mut conn)
 ///     .await?;
 ///
-/// println!("{:?}", account);
+/// println!("{account:?}");
 /// println!("{}: {}", account.id, account.name);
 ///
 /// # Ok(())
@@ -589,7 +589,7 @@ macro_rules! query_as (
 ///     .fetch_one(&mut conn)
 ///     .await?;
 ///
-/// println!("{:?}", account);
+/// println!("{account:?}");
 /// println!("{}: {}", account.id, account.name);
 ///
 /// # Ok(())
diff --git a/tests/any/any.rs b/tests/any/any.rs
index 5b14e782eb..2c59ca5339 100644
--- a/tests/any/any.rs
+++ b/tests/any/any.rs
@@ -106,7 +106,7 @@ async fn it_can_fail_and_recover() -> anyhow::Result<()> {
 
         // now try and use the connection
         let val: i32 = conn
-            .fetch_one(&*format!("SELECT {}", i))
+            .fetch_one(&*format!("SELECT {i}"))
             .await?
             .get_unchecked(0);
 
@@ -132,7 +132,7 @@ async fn it_can_fail_and_recover_with_pool() -> anyhow::Result<()> {
 
         // now try and use the connection
         let val: i32 = pool
-            .fetch_one(&*format!("SELECT {}", i))
+            .fetch_one(&*format!("SELECT {i}"))
             .await?
             .get_unchecked(0);
 
diff --git a/tests/mysql/macros.rs b/tests/mysql/macros.rs
index 24807d5606..bcf9c84845 100644
--- a/tests/mysql/macros.rs
+++ b/tests/mysql/macros.rs
@@ -27,7 +27,7 @@ async fn macro_select_from_cte_bind() -> anyhow::Result<()> {
     .fetch_one(&mut conn)
     .await?;
 
-    println!("{:?}", account);
+    println!("{account:?}");
     println!("{}: {}", account.id, account.name);
 
     Ok(())
@@ -53,7 +53,7 @@ async fn test_query_as_raw() -> anyhow::Result<()> {
     assert_eq!(account.name, None);
     assert_eq!(account.r#type, 1);
 
-    println!("{:?}", account);
+    println!("{account:?}");
 
     Ok(())
 }
diff --git a/tests/mysql/mysql.rs b/tests/mysql/mysql.rs
index 58f4369095..ba57a01d8e 100644
--- a/tests/mysql/mysql.rs
+++ b/tests/mysql/mysql.rs
@@ -347,7 +347,7 @@ async fn test_issue_622() -> anyhow::Result<()> {
         .connect(&std::env::var("DATABASE_URL").unwrap())
         .await?;
 
-    println!("pool state: {:?}", pool);
+    println!("pool state: {pool:?}");
 
     let mut handles = vec![];
 
@@ -375,7 +375,7 @@ async fn test_issue_622() -> anyhow::Result<()> {
                         println!("{} acquire took {:?}", i, start.elapsed());
                         drop(conn);
                     }
-                    Err(e) => panic!("{} acquire returned error: {} pool state: {:?}", i, e, pool),
+                    Err(e) => panic!("{i} acquire returned error: {e} pool state: {pool:?}"),
                 }
             }
 
diff --git a/tests/postgres/derives.rs b/tests/postgres/derives.rs
index c0ce234543..47eb7854ce 100644
--- a/tests/postgres/derives.rs
+++ b/tests/postgres/derives.rs
@@ -247,7 +247,7 @@ SELECT id, mood FROM people WHERE id = $1
     conn.close().await?;
     let mut conn = new::<Postgres>().await?;
 
-    let stmt = format!("SELECT id, mood FROM people WHERE id = {}", people_id);
+    let stmt = format!("SELECT id, mood FROM people WHERE id = {people_id}");
     dbg!(&stmt);
 
     let mut cursor = conn.fetch(&*stmt);
@@ -484,7 +484,7 @@ async fn test_from_row_with_keyword() -> anyhow::Result<()> {
     )
     .fetch_one(&mut conn)
     .await?;
-    println!("{:?}", account);
+    println!("{account:?}");
 
     assert_eq!(1, account.r#type);
     assert_eq!("foo", account.r#static);
@@ -522,7 +522,7 @@ async fn test_from_row_with_rename() -> anyhow::Result<()> {
     )
     .fetch_one(&mut conn)
     .await?;
-    println!("{:?}", account);
+    println!("{account:?}");
 
     assert_eq!(1, account.own_type);
     assert_eq!("foo", account.my_static);
@@ -551,7 +551,7 @@ async fn test_from_row_with_rename_all() -> anyhow::Result<()> {
     )
     .fetch_one(&mut conn)
     .await?;
-    println!("{:?}", account);
+    println!("{account:?}");
 
     assert_eq!(1, account.user_id);
     assert_eq!("foo", account.user_name);
@@ -613,7 +613,7 @@ async fn test_default() -> anyhow::Result<()> {
     let has_default: HasDefault = sqlx::query_as(r#"SELECT 1 AS not_default"#)
         .fetch_one(&mut conn)
         .await?;
-    println!("{:?}", has_default);
+    println!("{has_default:?}");
 
     assert_eq!(has_default.not_default, 1);
     assert_eq!(has_default.default, None);
@@ -652,7 +652,7 @@ async fn test_flatten() -> anyhow::Result<()> {
     )
     .fetch_one(&mut conn)
     .await?;
-    println!("{:?}", account);
+    println!("{account:?}");
 
     assert_eq!(1, account.id);
     assert_eq!("foo", account.info.name);
@@ -682,7 +682,7 @@ async fn test_skip() -> anyhow::Result<()> {
     let account: AccountKeyword = sqlx::query_as(r#"SELECT * from (VALUES (1)) accounts("id")"#)
         .fetch_one(&mut conn)
         .await?;
-    println!("{:?}", account);
+    println!("{account:?}");
 
     assert_eq!(1, account.id);
     assert_eq!(None, account.default.default);
diff --git a/tests/postgres/macros.rs b/tests/postgres/macros.rs
index be2271e9a5..81bf0571fc 100644
--- a/tests/postgres/macros.rs
+++ b/tests/postgres/macros.rs
@@ -114,7 +114,7 @@ async fn test_query_file() -> anyhow::Result<()> {
     let mut conn = new::<Postgres>().await?;
 
     // keep trailing comma as a test
-    let account = sqlx::query_file!("tests/postgres/test-query.sql",)
+    let account = sqlx::query_file!("tests/postgres/test-query.sql")
         .fetch_one(&mut conn)
         .await?;
 
@@ -146,7 +146,7 @@ async fn test_query_as() -> anyhow::Result<()> {
     assert_eq!(1, account.id);
     assert_eq!(None, account.name);
 
-    println!("{:?}", account);
+    println!("{account:?}");
 
     Ok(())
 }
@@ -171,7 +171,7 @@ async fn test_query_as_raw() -> anyhow::Result<()> {
     assert_eq!(None, account.name);
     assert_eq!(1, account.r#type);
 
-    println!("{:?}", account);
+    println!("{account:?}");
 
     Ok(())
 }
@@ -180,11 +180,11 @@ async fn test_query_as_raw() -> anyhow::Result<()> {
 async fn test_query_file_as() -> anyhow::Result<()> {
     let mut conn = new::<Postgres>().await?;
 
-    let account = sqlx::query_file_as!(Account, "tests/postgres/test-query.sql",)
+    let account = sqlx::query_file_as!(Account, "tests/postgres/test-query.sql")
         .fetch_one(&mut conn)
         .await?;
 
-    println!("{:?}", account);
+    println!("{account:?}");
 
     Ok(())
 }
@@ -338,7 +338,7 @@ async fn test_nullable_err() -> anyhow::Result<()> {
         }
     }
 
-    panic!("expected `UnexpectedNullError`, got {}", err)
+    panic!("expected `UnexpectedNullError`, got {err}")
 }
 
 #[sqlx_macros::test]
diff --git a/tests/postgres/postgres.rs b/tests/postgres/postgres.rs
index 7bee4d86ac..477a455d74 100644
--- a/tests/postgres/postgres.rs
+++ b/tests/postgres/postgres.rs
@@ -305,10 +305,7 @@ async fn it_can_fail_and_recover() -> anyhow::Result<()> {
         assert!(res.is_err());
 
         // now try and use the connection
-        let val: i32 = conn
-            .fetch_one(&*format!("SELECT {}::int4", i))
-            .await?
-            .get(0);
+        let val: i32 = conn.fetch_one(&*format!("SELECT {i}::int4")).await?.get(0);
 
         assert_eq!(val, i);
     }
@@ -329,10 +326,7 @@ async fn it_can_fail_and_recover_with_pool() -> anyhow::Result<()> {
         assert!(res.is_err());
 
         // now try and use the connection
-        let val: i32 = pool
-            .fetch_one(&*format!("SELECT {}::int4", i))
-            .await?
-            .get(0);
+        let val: i32 = pool.fetch_one(&*format!("SELECT {i}::int4")).await?.get(0);
 
         assert_eq!(val, i);
     }
@@ -558,9 +552,9 @@ async fn pool_smoke_test() -> anyhow::Result<()> {
                 if let Err(e) = sqlx::query("select 1 + 1").execute(&pool).await {
                     // normal error at termination of the test
                     if matches!(e, sqlx::Error::PoolClosed) {
-                        eprintln!("pool task {} exiting normally after {} iterations", i, j);
+                        eprintln!("pool task {i} exiting normally after {j} iterations");
                     } else {
-                        eprintln!("pool task {} dying due to {} after {} iterations", i, e, j);
+                        eprintln!("pool task {i} dying due to {e} after {j} iterations");
                     }
                     break;
                 }
@@ -739,7 +733,7 @@ async fn it_closes_statement_from_cache_issue_470() -> anyhow::Result<()> {
     let mut conn = PgConnection::connect_with(&options).await?;
 
     for i in 0..5 {
-        let row = sqlx::query(&*format!("SELECT {}::int4 AS val", i))
+        let row = sqlx::query(&*format!("SELECT {i}::int4 AS val"))
             .fetch_one(&mut conn)
             .await?;
 
@@ -822,7 +816,7 @@ async fn test_issue_622() -> anyhow::Result<()> {
         .connect(&std::env::var("DATABASE_URL").unwrap())
         .await?;
 
-    println!("pool state: {:?}", pool);
+    println!("pool state: {pool:?}");
 
     let mut handles = vec![];
 
@@ -850,7 +844,7 @@ async fn test_issue_622() -> anyhow::Result<()> {
                         println!("{} acquire took {:?}", i, start.elapsed());
                         drop(conn);
                     }
-                    Err(e) => panic!("{} acquire returned error: {} pool state: {:?}", i, e, pool),
+                    Err(e) => panic!("{i} acquire returned error: {e} pool state: {pool:?}"),
                 }
             }
 
@@ -1782,7 +1776,7 @@ async fn test_postgres_bytea_hex_deserialization_errors() -> anyhow::Result<()>
     let mut conn = new::<Postgres>().await?;
     conn.execute("SET bytea_output = 'escape';").await?;
     for value in ["", "DEADBEEF"] {
-        let query = format!("SELECT '\\x{}'::bytea", value);
+        let query = format!("SELECT '\\x{value}'::bytea");
         let res: sqlx::Result<Vec<u8>> = conn.fetch_one(query.as_str()).await?.try_get(0usize);
         // Deserialization only supports hex format so this should error and definitely not panic.
         res.unwrap_err();
diff --git a/tests/sqlite/describe.rs b/tests/sqlite/describe.rs
index c10f16f439..18d43fa815 100644
--- a/tests/sqlite/describe.rs
+++ b/tests/sqlite/describe.rs
@@ -421,10 +421,10 @@ async fn it_describes_literal_subquery() -> anyhow::Result<()> {
     ) -> anyhow::Result<()> {
         let info = conn.describe(query).await?;
 
-        assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-        assert_eq!(info.nullable(0), Some(false), "{}", query);
-        assert_eq!(info.column(1).type_info().name(), "NULL", "{}", query);
-        assert_eq!(info.nullable(1), Some(true), "{}", query);
+        assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+        assert_eq!(info.nullable(0), Some(false), "{query}");
+        assert_eq!(info.column(1).type_info().name(), "NULL", "{query}");
+        assert_eq!(info.nullable(1), Some(true), "{query}");
 
         Ok(())
     }
@@ -458,25 +458,25 @@ async fn assert_tweet_described(
     let info = conn.describe(query).await?;
     let columns = info.columns();
 
-    assert_eq!(columns[0].name(), "id", "{}", query);
-    assert_eq!(columns[1].name(), "text", "{}", query);
-    assert_eq!(columns[2].name(), "is_sent", "{}", query);
-    assert_eq!(columns[3].name(), "owner_id", "{}", query);
+    assert_eq!(columns[0].name(), "id", "{query}");
+    assert_eq!(columns[1].name(), "text", "{query}");
+    assert_eq!(columns[2].name(), "is_sent", "{query}");
+    assert_eq!(columns[3].name(), "owner_id", "{query}");
 
-    assert_eq!(columns[0].ordinal(), 0, "{}", query);
-    assert_eq!(columns[1].ordinal(), 1, "{}", query);
-    assert_eq!(columns[2].ordinal(), 2, "{}", query);
-    assert_eq!(columns[3].ordinal(), 3, "{}", query);
+    assert_eq!(columns[0].ordinal(), 0, "{query}");
+    assert_eq!(columns[1].ordinal(), 1, "{query}");
+    assert_eq!(columns[2].ordinal(), 2, "{query}");
+    assert_eq!(columns[3].ordinal(), 3, "{query}");
 
-    assert_eq!(info.nullable(0), Some(false), "{}", query);
-    assert_eq!(info.nullable(1), Some(false), "{}", query);
-    assert_eq!(info.nullable(2), Some(false), "{}", query);
-    assert_eq!(info.nullable(3), Some(true), "{}", query);
+    assert_eq!(info.nullable(0), Some(false), "{query}");
+    assert_eq!(info.nullable(1), Some(false), "{query}");
+    assert_eq!(info.nullable(2), Some(false), "{query}");
+    assert_eq!(info.nullable(3), Some(true), "{query}");
 
-    assert_eq!(columns[0].type_info().name(), "INTEGER", "{}", query);
-    assert_eq!(columns[1].type_info().name(), "TEXT", "{}", query);
-    assert_eq!(columns[2].type_info().name(), "BOOLEAN", "{}", query);
-    assert_eq!(columns[3].type_info().name(), "INTEGER", "{}", query);
+    assert_eq!(columns[0].type_info().name(), "INTEGER", "{query}");
+    assert_eq!(columns[1].type_info().name(), "TEXT", "{query}");
+    assert_eq!(columns[2].type_info().name(), "BOOLEAN", "{query}");
+    assert_eq!(columns[3].type_info().name(), "INTEGER", "{query}");
 
     Ok(())
 }
@@ -517,10 +517,10 @@ async fn it_describes_table_order_by() -> anyhow::Result<()> {
     ) -> anyhow::Result<()> {
         let info = conn.describe(query).await?;
 
-        assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-        assert_eq!(info.nullable(0), Some(false), "{}", query);
-        assert_eq!(info.column(1).type_info().name(), "TEXT", "{}", query);
-        assert_eq!(info.nullable(1), Some(false), "{}", query);
+        assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+        assert_eq!(info.nullable(0), Some(false), "{query}");
+        assert_eq!(info.column(1).type_info().name(), "TEXT", "{query}");
+        assert_eq!(info.nullable(1), Some(false), "{query}");
 
         Ok(())
     }
@@ -555,15 +555,15 @@ async fn it_describes_union() -> anyhow::Result<()> {
     ) -> anyhow::Result<()> {
         let info = conn.describe(query).await?;
 
-        assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-        assert_eq!(info.nullable(0), Some(false), "{}", query);
-        assert_eq!(info.column(1).type_info().name(), "TEXT", "{}", query);
-        assert_eq!(info.nullable(1), Some(true), "{}", query);
-        assert_eq!(info.column(2).type_info().name(), "INTEGER", "{}", query);
-        assert_eq!(info.nullable(2), Some(true), "{}", query);
+        assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+        assert_eq!(info.nullable(0), Some(false), "{query}");
+        assert_eq!(info.column(1).type_info().name(), "TEXT", "{query}");
+        assert_eq!(info.nullable(1), Some(true), "{query}");
+        assert_eq!(info.column(2).type_info().name(), "INTEGER", "{query}");
+        assert_eq!(info.nullable(2), Some(true), "{query}");
         //TODO: mixed type columns not handled correctly
-        //assert_eq!(info.column(3).type_info().name(), "NULL", "{}", query);
-        //assert_eq!(info.nullable(3), Some(false), "{}", query);
+        //assert_eq!(info.column(3).type_info().name(), "NULL", "{query}");
+        //assert_eq!(info.nullable(3), Some(false), "{query}");
 
         Ok(())
     }
@@ -602,8 +602,8 @@ async fn it_describes_strange_queries() -> anyhow::Result<()> {
         nullable: bool,
     ) -> anyhow::Result<()> {
         let info = conn.describe(query).await?;
-        assert_eq!(info.column(0).type_info().name(), typename, "{}", query);
-        assert_eq!(info.nullable(0), Some(nullable), "{}", query);
+        assert_eq!(info.column(0).type_info().name(), typename, "{query}");
+        assert_eq!(info.nullable(0), Some(nullable), "{query}");
 
         Ok(())
     }
@@ -704,23 +704,23 @@ async fn it_describes_func_date() -> anyhow::Result<()> {
 
     let query = "SELECT date();";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(false), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(false), "{query}");
 
     let query = "SELECT date('now');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT date('now', 'start of month');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT date(:datebind);";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
     Ok(())
 }
 
@@ -730,23 +730,23 @@ async fn it_describes_func_time() -> anyhow::Result<()> {
 
     let query = "SELECT time();";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(false), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(false), "{query}");
 
     let query = "SELECT time('now');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT time('now', 'start of month');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT time(:datebind);";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
     Ok(())
 }
 
@@ -756,23 +756,23 @@ async fn it_describes_func_datetime() -> anyhow::Result<()> {
 
     let query = "SELECT datetime();";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(false), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(false), "{query}");
 
     let query = "SELECT datetime('now');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT datetime('now', 'start of month');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT datetime(:datebind);";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
     Ok(())
 }
 
@@ -782,23 +782,23 @@ async fn it_describes_func_julianday() -> anyhow::Result<()> {
 
     let query = "SELECT julianday();";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "REAL", "{}", query);
-    assert_eq!(info.nullable(0), Some(false), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "REAL", "{query}");
+    assert_eq!(info.nullable(0), Some(false), "{query}");
 
     let query = "SELECT julianday('now');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "REAL", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "REAL", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT julianday('now', 'start of month');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "REAL", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "REAL", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT julianday(:datebind);";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "REAL", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "REAL", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
     Ok(())
 }
 
@@ -808,18 +808,18 @@ async fn it_describes_func_strftime() -> anyhow::Result<()> {
 
     let query = "SELECT strftime('%s','now');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT strftime('%s', 'now', 'start of month');";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query); //can't prove that it's not-null yet
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}"); //can't prove that it's not-null yet
 
     let query = "SELECT strftime('%s',:datebind);";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
     Ok(())
 }
 
@@ -842,8 +842,8 @@ async fn it_describes_with_recursive() -> anyhow::Result<()> {
          GROUP BY begin_date
         ";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
 
     let query = "
         WITH RECURSIVE schedule(begin_date) AS MATERIALIZED (
@@ -860,8 +860,8 @@ async fn it_describes_with_recursive() -> anyhow::Result<()> {
          GROUP BY begin_date
         ";
     let info = conn.describe(query).await?;
-    assert_eq!(info.column(0).type_info().name(), "TEXT", "{}", query);
-    assert_eq!(info.nullable(0), Some(true), "{}", query);
+    assert_eq!(info.column(0).type_info().name(), "TEXT", "{query}");
+    assert_eq!(info.nullable(0), Some(true), "{query}");
 
     Ok(())
 }
diff --git a/tests/sqlite/sqlite.rs b/tests/sqlite/sqlite.rs
index 0c79bec1f3..d4cb4b881f 100644
--- a/tests/sqlite/sqlite.rs
+++ b/tests/sqlite/sqlite.rs
@@ -651,7 +651,7 @@ async fn issue_1467() -> anyhow::Result<()> {
 
     for i in 0..1_000_000 {
         if i % 1_000 == 0 {
-            println!("{}", i);
+            println!("{i}");
         }
         let key = rng.gen_range(0..1_000);
         let value = rng.gen_range(0..1_000);
@@ -759,21 +759,21 @@ async fn test_multiple_set_progress_handler_calls_drop_old_handler() -> anyhow::
 
         let o = ref_counted_object.clone();
         conn.lock_handle().await?.set_progress_handler(1, move || {
-            println!("{:?}", o);
+            println!("{o:?}");
             false
         });
         assert_eq!(2, Arc::strong_count(&ref_counted_object));
 
         let o = ref_counted_object.clone();
         conn.lock_handle().await?.set_progress_handler(1, move || {
-            println!("{:?}", o);
+            println!("{o:?}");
             false
         });
         assert_eq!(2, Arc::strong_count(&ref_counted_object));
 
         let o = ref_counted_object.clone();
         conn.lock_handle().await?.set_progress_handler(1, move || {
-            println!("{:?}", o);
+            println!("{o:?}");
             false
         });
         assert_eq!(2, Arc::strong_count(&ref_counted_object));