inlined format args: rust-lang/rust-clippy#14160

Author: shawntabrizi

steps/12/README.md

@@ -21,7 +21,7 @@ Methods like `checked_add` and `checked_sub` return `Option` to indicate success
 ```rust
 let result = a.checked_add(b);
 match result {
-    Some(sum) => println!("Sum: {}", sum),
+    Some(sum) => println!("Sum: {sum}"),
     None => println!("Overflow occurred."),
 }
 ```

steps/21/README.md

@@ -47,7 +47,7 @@ Absolutely not! This is the kind of error that our runtime should be able to han
 When a transaction returns an error we should show that error to the user, and then "swallow" the result. For example:
 
 ```rust
-let _res = i_can_return_error().map_err(|e| eprintln!("{}", e));
+let _res = i_can_return_error().map_err(|e| eprintln!("{e}"));
 ```
 
 In this case, you can see that any error that `i_can_return_error` would return gets printed to the console, but otherwise, the `Result` of that function gets placed in an unused variable `_res`.

steps/22/src/main.rs

@@ -29,12 +29,9 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 }

steps/23/README.md

@@ -38,7 +38,7 @@ With the `Debug` trait derived, you can now print the `struct` to console:
 
 ```rust
 let my_instance = MyStruct { field1: 42, field2: "Hello".to_string() };
-println!("{:#?}", my_instance);
+println!("{my_instance:#?}");
 ```
 
 The characters `:#?` help [format](https://doc.rust-lang.org/std/fmt/) the output to make it more readable.

steps/23/src/main.rs

@@ -30,14 +30,11 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 
 	/* TODO: Print the final runtime state after all transactions. */
 }

steps/24/src/main.rs

@@ -30,14 +30,11 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 
-	println!("{:#?}", runtime);
+	println!("{runtime:#?}");
 }

steps/25/src/main.rs

@@ -30,14 +30,11 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 
-	println!("{:#?}", runtime);
+	println!("{runtime:#?}");
 }

steps/26/src/main.rs

@@ -30,14 +30,11 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 
-	println!("{:#?}", runtime);
+	println!("{runtime:#?}");
 }

steps/27/src/main.rs

@@ -30,14 +30,11 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 
-	println!("{:#?}", runtime);
+	println!("{runtime:#?}");
 }

steps/28/src/main.rs

@@ -30,14 +30,11 @@ fn main() {
 
 	// first transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime
-		.balances
-		.transfer(alice.clone(), bob, 30)
-		.map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice.clone(), bob, 30).map_err(|e| eprintln!("{e}"));
 
 	// second transaction
 	runtime.system.inc_nonce(&alice);
-	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{}", e));
+	let _res = runtime.balances.transfer(alice, charlie, 20).map_err(|e| eprintln!("{e}"));
 
-	println!("{:#?}", runtime);
+	println!("{runtime:#?}");
 }