mdBook generated from gitorial

Author: shawntabrizi

src/13/solution/solution.diff

@@ -1,8 +1,8 @@
 diff --git a/src/main.rs b/src/main.rs
-index 6c117f65..808d6732 100644
+index 6c117f65..8554121f 100644
 --- a/src/main.rs
 +++ b/src/main.rs
-@@ -16,22 +16,25 @@ impl Runtime {
+@@ -16,22 +16,22 @@ impl Runtime {
  }
 
  fn main() {
@@ -29,14 +29,11 @@ index 6c117f65..808d6732 100644
 -		- We should capture the result of the transfer in an unused variable like `_res`.
 -	*/
 +	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
 -	/* TODO: Increment the nonce of `alice` again. */
 -	/* TODO: Execute another balance transfer, this time from `alice` to `charlie` for 20. */
 +	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}"));
  }

src/13/solution/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}"));
 }

src/13/template/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`.

src/14/solution/solution.diff

@@ -12,7 +12,7 @@ index 1b9d9d85..e09906cb 100644
  	// A simple storage mapping from accounts (`String`) to their balances (`u128`).
  	balances: BTreeMap<String, u128>,
 diff --git a/src/main.rs b/src/main.rs
-index b79655ae..1ebef924 100644
+index a2e06f25..a3827f6f 100644
 --- a/src/main.rs
 +++ b/src/main.rs
 @@ -3,7 +3,7 @@ mod system;
@@ -24,12 +24,12 @@ index b79655ae..1ebef924 100644
  pub struct Runtime {
  	system: system::Pallet,
  	balances: balances::Pallet,
-@@ -39,5 +39,5 @@ fn main() {
+@@ -36,5 +36,5 @@ fn main() {
  	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. */
-+	println!("{:#?}", runtime);
++	println!("{runtime:#?}");
  }
 diff --git a/src/system.rs b/src/system.rs
 index cbf3b195..2fc5d764 100644

src/14/solution/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:#?}");
 }

src/14/template/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.

src/14/template/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. */
 }

src/14/template/template.diff

@@ -11,7 +11,7 @@ index 78f233df..1b9d9d85 100644
  	// A simple storage mapping from accounts (`String`) to their balances (`u128`).
  	balances: BTreeMap<String, u128>,
 diff --git a/src/main.rs b/src/main.rs
-index 808d6732..b79655ae 100644
+index 8554121f..a2e06f25 100644
 --- a/src/main.rs
 +++ b/src/main.rs
 @@ -3,6 +3,7 @@ mod system;
@@ -22,10 +22,10 @@ index 808d6732..b79655ae 100644
  pub struct Runtime {
  	system: system::Pallet,
  	balances: balances::Pallet,
-@@ -37,4 +38,6 @@ fn main() {
+@@ -34,4 +35,6 @@ fn main() {
  	// 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. */
  }

src/15/source/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:#?}");
 }

src/16/solution/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:#?}");
 }