ch08 一般的なコレクションの和訳を最新版に更新

rust-lang/book@19c40bf

Author: shinmili

listings/ch08-common-collections/listing-08-01/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "collections"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch08-common-collections/listing-08-02/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "collections"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch08-common-collections/listing-08-03/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "collections"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch08-common-collections/listing-08-04/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "collections"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch08-common-collections/listing-08-04/src/main.rs

@@ -1,9 +1,17 @@
 fn main() {
     // ANCHOR: here
-    {
-        let v = vec![1, 2, 3, 4];
+    let v = vec![1, 2, 3, 4, 5];
 
-        // vで作業をする
-    } // <- vはここでスコープを抜け、解放される
-      // ANCHOR_END: here
+    let third: &i32 = &v[2];
+    //       "3つ目の要素は{third}です"
+    println!("The third element is {third}");
+
+    let third: Option<&i32> = v.get(2);
+    match third {
+        //                      "3つ目の要素は{third}です"
+        Some(third) => println!("The third element is {third}"),
+        //               "3つ目の要素はありません。"
+        None => println!("There is no third element."),
+    }
+    // ANCHOR_END: here
 }

listings/ch08-common-collections/listing-08-05/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "collections"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch08-common-collections/listing-08-05/src/main.rs

@@ -2,14 +2,7 @@ fn main() {
     // ANCHOR: here
     let v = vec![1, 2, 3, 4, 5];
 
-    let third: &i32 = &v[2];
-    println!("The third element is {}", third);
-
-    match v.get(2) {
-        //                      "3つ目の要素は{}です"
-        Some(third) => println!("The third element is {}", third),
-        //               "3つ目の要素はありません。"
-        None => println!("There is no third element."),
-    }
+    let does_not_exist = &v[100];
+    let does_not_exist = v.get(100);
     // ANCHOR_END: here
 }

listings/ch08-common-collections/listing-08-06/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "collections"
 version = "0.1.0"
-authors = ["Your Name <you@example.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]

listings/ch08-common-collections/listing-08-07/output.txt renamed to listings/ch08-common-collections/listing-08-06/output.txt

@@ -7,18 +7,14 @@ error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immuta
 4 |     let first = &v[0];
   |                  - immutable borrow occurs here
   |                   (不変借用はここで発生しています)
-5 | 
+5 |
 6 |     v.push(6);
   |     ^^^^^^^^^ mutable borrow occurs here
   |              (可変借用はここで発生しています)
-7 | 
-8 |     println!("The first element is: {}", first);
-  |                                          ----- immutable borrow later used here
-  |                                               (その後、不変借用はここで使われています)
-
-error: aborting due to previous error
+7 |
+8 |     println!("The first element is: {first}");
+  |                                     ------- immutable borrow later used here
+  |                                            (その後、不変借用はここで使われています)
 
 For more information about this error, try `rustc --explain E0502`.
-error: could not compile `collections`.
-
-To learn more, run the command again with --verbose.
+error: could not compile `collections` (bin "collections") due to 1 previous error

listings/ch08-common-collections/listing-08-06/src/main.rs

@@ -1,8 +1,12 @@
 fn main() {
     // ANCHOR: here
-    let v = vec![1, 2, 3, 4, 5];
+    let mut v = vec![1, 2, 3, 4, 5];
 
-    let does_not_exist = &v[100];
-    let does_not_exist = v.get(100);
+    let first = &v[0];
+
+    v.push(6);
+
+    //       "最初の要素は: {first}"
+    println!("The first element is: {first}");
     // ANCHOR_END: here
 }