Update to Rust 1.90

carols10cents · carols10cents · commit f660f341887c · 2025-10-27T21:41:51.000-04:00
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -12,8 +12,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.89 -c rust-docs
-        rustup default 1.89
+        rustup toolchain install 1.90 -c rust-docs
+        rustup default 1.90
     - name: Install mdbook
       run: |
         mkdir bin
@@ -47,8 +47,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.89 -c rust-docs
-        rustup default 1.89
+        rustup toolchain install 1.90 -c rust-docs
+        rustup default 1.90
     - name: Run `tools` package tests
       run: |
         cargo test
diff --git a/listings/ch02-guessing-game-tutorial/listing-02-04/output.txt b/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/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/cmp.rs:976:8
+  --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/cmp.rs:979:8
 
 For more information about this error, try `rustc --explain E0308`.
 error: could not compile `guessing_game` (bin "guessing_game") due to 1 previous error
diff --git a/listings/ch05-using-structs-to-structure-related-data/output-only-01-debug/output.txt b/listings/ch05-using-structs-to-structure-related-data/output-only-01-debug/output.txt
@@ -13,8 +13,8 @@ error[E0277]: `Rectangle` doesn't implement `Debug`
    = 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 annotating `Rectangle` with `#[derive(Debug)]`
    |
-1  + #[derive(Debug)]
-2  | struct Rectangle {
+ 1 + #[derive(Debug)]
+ 2 | struct Rectangle {
    |
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/listings/ch06-enums-and-pattern-matching/no-listing-10-non-exhaustive-match/output.txt b/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/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/option.rs:591:1
- ::: /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/option.rs:595:5
+ --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/option.rs:593:1
+ ::: /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/option.rs:597:5
   |
   = note: not covered
   = note: the matched value is of type `Option<i32>`
diff --git a/listings/ch07-managing-growing-projects/listing-07-03/output.txt b/listings/ch07-managing-growing-projects/listing-07-03/output.txt
@@ -25,7 +25,7 @@ error[E0603]: module `hosting` is private
 note: the module `hosting` is defined here
   --> src/lib.rs:2:5
    |
-2  |     mod hosting {
+ 2 |     mod hosting {
    |     ^^^^^^^^^^^
 
 For more information about this error, try `rustc --explain E0603`.
diff --git a/listings/ch07-managing-growing-projects/listing-07-05/output.txt b/listings/ch07-managing-growing-projects/listing-07-05/output.txt
@@ -9,7 +9,7 @@ error[E0603]: function `add_to_waitlist` is private
 note: the function `add_to_waitlist` is defined here
   --> src/lib.rs:3:9
    |
-3  |         fn add_to_waitlist() {}
+ 3 |         fn add_to_waitlist() {}
    |         ^^^^^^^^^^^^^^^^^^^^
 
 error[E0603]: function `add_to_waitlist` is private
@@ -21,7 +21,7 @@ error[E0603]: function `add_to_waitlist` is private
 note: the function `add_to_waitlist` is defined here
   --> src/lib.rs:3:9
    |
-3  |         fn add_to_waitlist() {}
+ 3 |         fn add_to_waitlist() {}
    |         ^^^^^^^^^^^^^^^^^^^^
 
 For more information about this error, try `rustc --explain E0603`.
diff --git a/listings/ch13-functional-features/listing-13-03/output.txt b/listings/ch13-functional-features/listing-13-03/output.txt
@@ -4,9 +4,8 @@ error[E0308]: mismatched types
  --> src/main.rs:5:29
   |
 5 |     let n = example_closure(5);
-  |             --------------- ^- help: try using a conversion method: `.to_string()`
-  |             |               |
-  |             |               expected `String`, found integer
+  |             --------------- ^ expected `String`, found integer
+  |             |
   |             arguments to this function are incorrect
   |
 note: expected because the closure was earlier called with an argument of type `String`
@@ -21,6 +20,10 @@ note: closure parameter defined here
   |
 2 |     let example_closure = |x| x;
   |                            ^
+help: try using a conversion method
+  |
+5 |     let n = example_closure(5.to_string());
+  |                              ++++++++++++
 
 For more information about this error, try `rustc --explain E0308`.
 error: could not compile `closure-example` (bin "closure-example") due to 1 previous error
diff --git a/listings/ch13-functional-features/listing-13-08/output.txt b/listings/ch13-functional-features/listing-13-08/output.txt
@@ -4,12 +4,14 @@ error[E0507]: cannot move out of `value`, a captured variable in an `FnMut` clos
   --> src/main.rs:18:30
    |
 15 |     let value = String::from("closure called");
-   |         ----- captured outer variable
+   |         -----   ------------------------------ move occurs because `value` has type `String`, which does not implement the `Copy` trait
+   |         |
+   |         captured outer variable
 16 |
 17 |     list.sort_by_key(|r| {
    |                      --- captured by this `FnMut` closure
 18 |         sort_operations.push(value);
-   |                              ^^^^^ move occurs because `value` has type `String`, which does not implement the `Copy` trait
+   |                              ^^^^^ `value` is moved here
    |
 help: consider cloning the value if the performance cost is acceptable
    |
diff --git a/listings/ch15-smart-pointers/listing-15-17/output.txt b/listings/ch15-smart-pointers/listing-15-17/output.txt
@@ -3,12 +3,21 @@ $ cargo run
 error[E0382]: use of moved value: `a`
   --> src/main.rs:11:30
    |
-9  |     let a = Cons(5, Box::new(Cons(10, Box::new(Nil))));
+ 9 |     let a = Cons(5, Box::new(Cons(10, Box::new(Nil))));
    |         - move occurs because `a` has type `List`, which does not implement the `Copy` trait
 10 |     let b = Cons(3, Box::new(a));
    |                              - value moved here
 11 |     let c = Cons(4, Box::new(a));
    |                              ^ value used here after move
+   |
+note: if `List` implemented `Clone`, you could clone the value
+  --> src/main.rs:1:1
+   |
+ 1 | enum List {
+   | ^^^^^^^^^ consider implementing `Clone` for this type
+...
+10 |     let b = Cons(3, Box::new(a));
+   |                              - you could clone this value
 
 For more information about this error, try `rustc --explain E0382`.
 error: could not compile `cons-list` (bin "cons-list") due to 1 previous error
diff --git a/listings/ch15-smart-pointers/listing-15-21/output.txt b/listings/ch15-smart-pointers/listing-15-21/output.txt
@@ -8,8 +8,8 @@ error[E0596]: cannot borrow `self.sent_messages` as mutable, as it is behind a `
    |
 help: consider changing this to be a mutable reference in the `impl` method and the `trait` definition
    |
-2  ~     fn send(&mut self, msg: &str);
-3  | }
+ 2 ~     fn send(&mut self, msg: &str);
+ 3 | }
 ...
 56 |     impl Messenger for MockMessenger {
 57 ~         fn send(&mut self, message: &str) {
diff --git a/listings/ch16-fearless-concurrency/listing-16-09/output.txt b/listings/ch16-fearless-concurrency/listing-16-09/output.txt
@@ -3,9 +3,9 @@ $ cargo run
 error[E0382]: borrow of moved value: `val`
   --> src/main.rs:10:27
    |
-8  |         let val = String::from("hi");
+ 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();
+ 9 |         tx.send(val).unwrap();
    |                 --- value moved here
 10 |         println!("val is {val}");
    |                           ^^^ value borrowed here after move
diff --git a/listings/ch16-fearless-concurrency/listing-16-13/output.txt b/listings/ch16-fearless-concurrency/listing-16-13/output.txt
@@ -3,21 +3,21 @@ $ cargo run
 error[E0382]: borrow of moved value: `counter`
   --> src/main.rs:21:29
    |
-5  |     let counter = Mutex::new(0);
-   |         ------- move occurs because `counter` has type `Mutex<i32>`, which does not implement the `Copy` trait
+ 5 |     let counter = Mutex::new(0);
+   |         ------- move occurs because `counter` has type `std::sync::Mutex<i32>`, which does not implement the `Copy` trait
 ...
-8  |     for _ in 0..10 {
+ 8 |     for _ in 0..10 {
    |     -------------- inside of this loop
-9  |         let handle = thread::spawn(move || {
+ 9 |         let handle = thread::spawn(move || {
    |                                    ------- value moved into closure here, in previous iteration of loop
 ...
 21 |     println!("Result: {}", *counter.lock().unwrap());
    |                             ^^^^^^^ value borrowed here after move
    |
 help: consider moving the expression out of the loop so it is only moved once
    |
-8  ~     let mut value = counter.lock();
-9  ~     for _ in 0..10 {
+ 8 ~     let mut value = counter.lock();
+ 9 ~     for _ in 0..10 {
 10 |         let handle = thread::spawn(move || {
 11 ~             let mut num = value.unwrap();
    |
diff --git a/listings/ch16-fearless-concurrency/listing-16-14/output.txt b/listings/ch16-fearless-concurrency/listing-16-14/output.txt
@@ -1,6 +1,6 @@
 $ cargo run
    Compiling shared-state v0.1.0 (file:///projects/shared-state)
-error[E0277]: `Rc<Mutex<i32>>` cannot be sent between threads safely
+error[E0277]: `Rc<std::sync::Mutex<i32>>` cannot be sent between threads safely
   --> src/main.rs:11:36
    |
 11 |           let handle = thread::spawn(move || {
@@ -13,16 +13,16 @@ error[E0277]: `Rc<Mutex<i32>>` cannot be sent between threads safely
 13 | |
 14 | |             *num += 1;
 15 | |         });
-   | |_________^ `Rc<Mutex<i32>>` cannot be sent between threads safely
+   | |_________^ `Rc<std::sync::Mutex<i32>>` cannot be sent between threads safely
    |
-   = help: within `{closure@src/main.rs:11:36: 11:43}`, the trait `Send` is not implemented for `Rc<Mutex<i32>>`
+   = help: within `{closure@src/main.rs:11:36: 11:43}`, the trait `Send` is not implemented for `Rc<std::sync::Mutex<i32>>`
 note: required because it's used within this closure
   --> src/main.rs:11:36
    |
 11 |         let handle = thread::spawn(move || {
    |                                    ^^^^^^^
 note: required by a bound in `spawn`
-  --> /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/thread/mod.rs:723:1
+  --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/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
diff --git a/listings/ch16-fearless-concurrency/output-only-01-move-drop/output.txt b/listings/ch16-fearless-concurrency/output-only-01-move-drop/output.txt
@@ -3,16 +3,23 @@ $ cargo run
 error[E0382]: use of moved value: `v`
   --> src/main.rs:10:10
    |
-4  |     let v = vec![1, 2, 3];
+ 4 |     let v = vec![1, 2, 3];
    |         - move occurs because `v` has type `Vec<i32>`, which does not implement the `Copy` trait
-5  |
-6  |     let handle = thread::spawn(move || {
+ 5 |
+ 6 |     let handle = thread::spawn(move || {
    |                                ------- value moved into closure here
-7  |         println!("Here's a vector: {v:?}");
+ 7 |         println!("Here's a vector: {v:?}");
    |                                     - variable moved due to use in closure
 ...
 10 |     drop(v); // oh no!
    |          ^ value used here after move
+   |
+help: consider cloning the value before moving it into the closure
+   |
+ 6 ~     let value = v.clone();
+ 7 ~     let handle = thread::spawn(move || {
+ 8 ~         println!("Here's a vector: {value:?}");
+   |
 
 For more information about this error, try `rustc --explain E0382`.
 error: could not compile `threads` (bin "threads") due to 1 previous error
diff --git a/listings/ch20-advanced-features/listing-20-21/output.txt b/listings/ch20-advanced-features/listing-20-21/output.txt
@@ -3,7 +3,7 @@ $ cargo run
 error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type
   --> src/main.rs:20:43
    |
-2  |     fn baby_name() -> String;
+ 2 |     fn baby_name() -> String;
    |     ------------------------- `Animal::baby_name` defined here
 ...
 20 |     println!("A baby dog is called a {}", Animal::baby_name());
diff --git a/listings/ch20-advanced-features/listing-20-33/output.txt b/listings/ch20-advanced-features/listing-20-33/output.txt
@@ -3,10 +3,10 @@ $ cargo build
 error[E0308]: mismatched types
   --> src/main.rs:2:44
    |
-2  |     let handlers = vec![returns_closure(), returns_initialized_closure(123)];
+ 2 |     let handlers = vec![returns_closure(), returns_initialized_closure(123)];
    |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected opaque type, found a different opaque type
 ...
-9  | fn returns_closure() -> impl Fn(i32) -> i32 {
+ 9 | fn returns_closure() -> impl Fn(i32) -> i32 {
    |                         ------------------- the expected opaque type
 ...
 13 | fn returns_initialized_closure(init: i32) -> impl Fn(i32) -> i32 {
diff --git a/listings/ch20-advanced-features/no-listing-02-impl-outlineprint-for-point/output.txt b/listings/ch20-advanced-features/no-listing-02-impl-outlineprint-for-point/output.txt
@@ -9,7 +9,7 @@ error[E0277]: `Point` doesn't implement `std::fmt::Display`
 note: required by a bound in `OutlinePrint`
   --> src/main.rs:3:21
    |
-3  | trait OutlinePrint: fmt::Display {
+ 3 | trait OutlinePrint: fmt::Display {
    |                     ^^^^^^^^^^^^ required by this bound in `OutlinePrint`
 
 error[E0277]: `Point` doesn't implement `std::fmt::Display`
@@ -21,9 +21,9 @@ error[E0277]: `Point` doesn't implement `std::fmt::Display`
 note: required by a bound in `OutlinePrint::outline_print`
   --> src/main.rs:3:21
    |
-3  | trait OutlinePrint: fmt::Display {
+ 3 | trait OutlinePrint: fmt::Display {
    |                     ^^^^^^^^^^^^ required by this bound in `OutlinePrint::outline_print`
-4  |     fn outline_print(&self) {
+ 4 |     fn outline_print(&self) {
    |        ------------- required by a bound in this associated function
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/listings/ch21-web-server/listing-21-22/output.txt b/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/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/std/src/thread/mod.rs:1896:17
+  --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/thread/mod.rs:1921:17
 
 For more information about this error, try `rustc --explain E0507`.
 error: could not compile `hello` (lib) due to 1 previous error
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-1.89
+1.90
diff --git a/src/title-page.md b/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 1.89.0 (released 2025-08-07)
+This version of the text assumes you’re using Rust 1.90.0 (released 2025-09-18)
 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

Original file line number	Diff line number	Diff line change
@@ -13,8 +13,8 @@ error[E0277]: `Rectangle` doesn't implement `Debug`
`13`	`13`	= 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)
`14`	`14`	help: consider annotating `Rectangle` with `#[derive(Debug)]`
`15`	`15`	`\|`
`16`		`-1 + #[derive(Debug)]`
`17`		`-2 \| struct Rectangle {`
	`16`	`+ 1 + #[derive(Debug)]`
	`17`	`+ 2 \| struct Rectangle {`
`18`	`18`	`\|`
`19`	`19`
`20`	`20`	For more information about this error, try `rustc --explain E0277`.
Original file line number	Diff line number	Diff line change
@@ -7,8 +7,8 @@ error[E0004]: non-exhaustive patterns: `None` not covered
`7`	`7`	\| ^ pattern `None` not covered
`8`	`8`	`\|`
`9`	`9`	note: `Option<i32>` defined here
`10`		`- --> /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/option.rs:591:1`
`11`		`- ::: /rustc/29483883eed69d5fb4db01964cdf2af4d86e9cb2/library/core/src/option.rs:595:5`
	`10`	`+ --> /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/option.rs:593:1`
	`11`	`+ ::: /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/option.rs:597:5`
`12`	`12`	`\|`
`13`	`13`	`= note: not covered`
`14`	`14`	= note: the matched value is of type `Option<i32>`
Original file line number	Diff line number	Diff line change
@@ -25,7 +25,7 @@ error[E0603]: module `hosting` is private
`25`	`25`	note: the module `hosting` is defined here
`26`	`26`	`--> src/lib.rs:2:5`
`27`	`27`	`\|`
`28`		`-2 \| mod hosting {`
	`28`	`+ 2 \| mod hosting {`
`29`	`29`	`\| ^^^^^^^^^^^`
`30`	`30`
`31`	`31`	For more information about this error, try `rustc --explain E0603`.
Original file line number	Diff line number	Diff line change
@@ -4,12 +4,14 @@ error[E0507]: cannot move out of `value`, a captured variable in an `FnMut` clos
`4`	`4`	`--> src/main.rs:18:30`
`5`	`5`	`\|`
`6`	`6`	`15 \| let value = String::from("closure called");`
`7`		`- \| ----- captured outer variable`
	`7`	+ \| ----- ------------------------------ move occurs because `value` has type `String`, which does not implement the `Copy` trait
	`8`	`+ \| \|`
	`9`	`+ \| captured outer variable`
`8`	`10`	`16 \|`
`9`	`11`	`17 \| list.sort_by_key(\|r\| {`
`10`	`12`	\| --- captured by this `FnMut` closure
`11`	`13`	`18 \| sort_operations.push(value);`
`12`		- \| ^^^^^ move occurs because `value` has type `String`, which does not implement the `Copy` trait
	`14`	+ \| ^^^^^ `value` is moved here
`13`	`15`	`\|`
`14`	`16`	`help: consider cloning the value if the performance cost is acceptable`
`15`	`17`	`\|`
Original file line number	Diff line number	Diff line change
@@ -8,8 +8,8 @@ error[E0596]: cannot borrow `self.sent_messages` as mutable, as it is behind a `
`8`	`8`	`\|`
`9`	`9`	help: consider changing this to be a mutable reference in the `impl` method and the `trait` definition
`10`	`10`	`\|`
`11`		`-2 ~ fn send(&mut self, msg: &str);`
`12`		`-3 \| }`
	`11`	`+ 2 ~ fn send(&mut self, msg: &str);`
	`12`	`+ 3 \| }`
`13`	`13`	`...`
`14`	`14`	`56 \| impl Messenger for MockMessenger {`
`15`	`15`	`57 ~ fn send(&mut self, message: &str) {`