Update to Rust 1.89

.github/workflows/main.yml

@@ -12,8 +12,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.88 -c rust-docs
-        rustup default 1.88
+        rustup toolchain install 1.89 -c rust-docs
+        rustup default 1.89
     - name: Install mdbook
       run: |
         mkdir bin
@@ -47,8 +47,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.88 -c rust-docs
-        rustup default 1.88
+        rustup toolchain install 1.89 -c rust-docs
+        rustup default 1.89
     - name: Run `tools` package tests
       run: |
         cargo test

listings/ch02-guessing-game-tutorial/listing-02-04/output.txt

@@ -18,7 +18,7 @@ error[E0308]: mismatched types
    = note: expected reference `&String`
               found reference `&{integer}`
 note: method defined here
-  --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/cmp.rs:975:8
+  --> /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/cmp.rs:976:8
 
 For more information about this error, try `rustc --explain E0308`.
 error: could not compile `guessing_game` (bin "guessing_game") due to 1 previous error

listings/ch04-understanding-ownership/no-listing-04-cant-use-after-move/output.txt

@@ -1,15 +1,15 @@
 $ cargo run
    Compiling ownership v0.1.0 (file:///projects/ownership)
 error[E0382]: borrow of moved value: `s1`
- --> src/main.rs:5:15
+ --> src/main.rs:5:16
   |
 2 |     let s1 = String::from("hello");
   |         -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait
 3 |     let s2 = s1;
   |              -- value moved here
 4 |
 5 |     println!("{s1}, world!");
-  |               ^^^^ value borrowed here after move
+  |                ^^ value borrowed here after move
   |
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 help: consider cloning the value if the performance cost is acceptable

listings/ch04-understanding-ownership/no-listing-10-multiple-mut-not-allowed/output.txt

@@ -9,7 +9,7 @@ error[E0499]: cannot borrow `s` as mutable more than once at a time
   |              ^^^^^^ second mutable borrow occurs here
 6 |
 7 |     println!("{r1}, {r2}");
-  |               ---- first borrow later used here
+  |                -- first borrow later used here
 
 For more information about this error, try `rustc --explain E0499`.
 error: could not compile `ownership` (bin "ownership") due to 1 previous error

listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/output.txt

@@ -10,7 +10,7 @@ error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immuta
   |              ^^^^^^ mutable borrow occurs here
 7 |
 8 |     println!("{r1}, {r2}, and {r3}");
-  |               ---- immutable borrow later used here
+  |                -- immutable borrow later used here
 
 For more information about this error, try `rustc --explain E0502`.
 error: could not compile `ownership` (bin "ownership") due to 1 previous error

listings/ch04-understanding-ownership/no-listing-19-slice-error/output.txt

@@ -10,7 +10,7 @@ error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immuta
    |     ^^^^^^^^^ mutable borrow occurs here
 19 |
 20 |     println!("the first word is: {word}");
-   |                                  ------ immutable borrow later used here
+   |                                   ---- immutable borrow later used here
 
 For more information about this error, try `rustc --explain E0502`.
 error: could not compile `ownership` (bin "ownership") due to 1 previous error

listings/ch05-using-structs-to-structure-related-data/listing-05-11/output.txt

@@ -1,10 +1,13 @@
 $ cargo run
    Compiling rectangles v0.1.0 (file:///projects/rectangles)
 error[E0277]: `Rectangle` doesn't implement `std::fmt::Display`
-  --> src/main.rs:12:24
+  --> src/main.rs:12:25
    |
 12 |     println!("rect1 is {rect1}");
-   |                        ^^^^^^^ `Rectangle` cannot be formatted with the default formatter
+   |                        -^^^^^-
+   |                        ||
+   |                        |`Rectangle` cannot be formatted with the default formatter
+   |                        required by this formatting parameter
    |
    = help: the trait `std::fmt::Display` is not implemented for `Rectangle`
    = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead

listings/ch05-using-structs-to-structure-related-data/output-only-01-debug/output.txt

@@ -4,7 +4,9 @@ error[E0277]: `Rectangle` doesn't implement `Debug`
   --> src/main.rs:12:31
    |
 12 |     println!("rect1 is {:?}", rect1);
-   |                               ^^^^^ `Rectangle` cannot be formatted using `{:?}`
+   |                        ----   ^^^^^ `Rectangle` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+   |                        |
+   |                        required by this formatting parameter
    |
    = help: the trait `Debug` is not implemented for `Rectangle`
    = note: add `#[derive(Debug)]` to `Rectangle` or manually `impl Debug for Rectangle`

listings/ch06-enums-and-pattern-matching/no-listing-10-non-exhaustive-match/output.txt

@@ -7,8 +7,8 @@ error[E0004]: non-exhaustive patterns: `None` not covered
   |               ^ pattern `None` not covered
   |
 note: `Option<i32>` defined here
- --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/option.rs:589:1
- ::: /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/option.rs:593:5
+ --> /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/option.rs:591:1
+ ::: /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/option.rs:595:5
   |
   = note: not covered
   = note: the matched value is of type `Option<i32>`

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

@@ -10,7 +10,7 @@ error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immuta
   |     ^^^^^^^^^ mutable borrow occurs here
 7 |
 8 |     println!("The first element is: {first}");
-  |                                     ------- immutable borrow later used here
+  |                                      ----- immutable borrow later used here
 
 For more information about this error, try `rustc --explain E0502`.
 error: could not compile `collections` (bin "collections") due to 1 previous error

listings/ch10-generic-types-traits-and-lifetimes/listing-10-16/output.txt

@@ -11,7 +11,7 @@ error[E0597]: `x` does not live long enough
   |     - `x` dropped here while still borrowed
 8 |
 9 |     println!("r: {r}");
-  |                  --- borrow later used here
+  |                   - borrow later used here
 
 For more information about this error, try `rustc --explain E0597`.
 error: could not compile `chapter10` (bin "chapter10") due to 1 previous error

listings/ch10-generic-types-traits-and-lifetimes/listing-10-23/output.txt

@@ -10,7 +10,7 @@ error[E0597]: `string2` does not live long enough
 7 |     }
   |     - `string2` dropped here while still borrowed
 8 |     println!("The longest string is {result}");
-  |                                     -------- borrow later used here
+  |                                      ------ borrow later used here
 
 For more information about this error, try `rustc --explain E0597`.
 error: could not compile `chapter10` (bin "chapter10") due to 1 previous error

listings/ch15-smart-pointers/listing-15-23/output.txt

@@ -11,7 +11,7 @@ failures:
 ---- tests::it_sends_an_over_75_percent_warning_message stdout ----
 
 thread 'tests::it_sends_an_over_75_percent_warning_message' panicked at src/lib.rs:60:53:
-already borrowed: BorrowMutError
+RefCell already borrowed
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 
 

listings/ch16-fearless-concurrency/listing-16-09/output.txt

@@ -1,14 +1,14 @@
 $ cargo run
    Compiling message-passing v0.1.0 (file:///projects/message-passing)
 error[E0382]: borrow of moved value: `val`
-  --> src/main.rs:10:26
+  --> src/main.rs:10:27
    |
 8  |         let val = String::from("hi");
    |             --- move occurs because `val` has type `String`, which does not implement the `Copy` trait
 9  |         tx.send(val).unwrap();
    |                 --- value moved here
 10 |         println!("val is {val}");
-   |                          ^^^^^ value borrowed here after move
+   |                           ^^^ value borrowed here after move
    |
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 

listings/ch16-fearless-concurrency/listing-16-14/output.txt

@@ -22,7 +22,7 @@ note: required because it's used within this closure
 11 |         let handle = thread::spawn(move || {
    |                                    ^^^^^^^
 note: required by a bound in `spawn`
-  --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/thread/mod.rs:723:1
+  --> /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/thread/mod.rs:723:1
 
 For more information about this error, try `rustc --explain E0277`.
 error: could not compile `shared-state` (bin "shared-state") due to 1 previous error

listings/ch20-advanced-features/no-listing-02-impl-outlineprint-for-point/output.txt

@@ -4,10 +4,8 @@ error[E0277]: `Point` doesn't implement `std::fmt::Display`
   --> src/main.rs:20:23
    |
 20 | impl OutlinePrint for Point {}
-   |                       ^^^^^ `Point` cannot be formatted with the default formatter
+   |                       ^^^^^ the trait `std::fmt::Display` is not implemented for `Point`
    |
-   = help: the trait `std::fmt::Display` is not implemented for `Point`
-   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
 note: required by a bound in `OutlinePrint`
   --> src/main.rs:3:21
    |
@@ -18,10 +16,8 @@ error[E0277]: `Point` doesn't implement `std::fmt::Display`
   --> src/main.rs:24:7
    |
 24 |     p.outline_print();
-   |       ^^^^^^^^^^^^^ `Point` cannot be formatted with the default formatter
+   |       ^^^^^^^^^^^^^ the trait `std::fmt::Display` is not implemented for `Point`
    |
-   = help: the trait `std::fmt::Display` is not implemented for `Point`
-   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
 note: required by a bound in `OutlinePrint::outline_print`
   --> src/main.rs:3:21
    |

listings/ch21-web-server/listing-21-22/output.txt

@@ -9,7 +9,7 @@ error[E0507]: cannot move out of `worker.thread` which is behind a mutable refer
    |             move occurs because `worker.thread` has type `JoinHandle<()>`, which does not implement the `Copy` trait
    |
 note: `JoinHandle::<T>::join` takes ownership of the receiver `self`, which moves `worker.thread`
-  --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/thread/mod.rs:1896:17
+  --> /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/thread/mod.rs:1896:17
 
 For more information about this error, try `rustc --explain E0507`.
 error: could not compile `hello` (lib) due to 1 previous error

rust-toolchain

@@ -1 +1 @@
-1.88
+1.89

src/title-page.md

@@ -3,7 +3,7 @@
 _by Steve Klabnik, Carol Nichols, and Chris Krycho, with contributions from the
 Rust Community_
 
-This version of the text assumes you’re using Rust 1.88.0 (released 2025-06-26)
+This version of the text assumes you’re using Rust 1.89.0 (released 2025-08-07)
 or later with `edition = "2024"` in the *Cargo.toml* file of all projects to
 configure them to use Rust 2024 Edition idioms. See the [“Installation” section
 of Chapter 1][install]<!-- ignore --> for instructions on installing or