Update to Rust 1.87

.github/workflows/main.yml

@@ -12,8 +12,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.86 -c rust-docs
-        rustup default 1.86
+        rustup toolchain install 1.87 -c rust-docs
+        rustup default 1.87
     - name: Install mdbook
       run: |
         mkdir bin
@@ -47,8 +47,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.86 -c rust-docs
-        rustup default 1.86
+        rustup toolchain install 1.87 -c rust-docs
+        rustup default 1.87
     - 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/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/cmp.rs:964:8
+  --> /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/cmp.rs:975:8
 
 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-14-dangling-reference/output.txt

@@ -17,12 +17,5 @@ help: instead, you are more likely to want to return an owned value
 5 + fn dangle() -> String {
   |
 
-error[E0515]: cannot return reference to local variable `s`
- --> src/main.rs:8:5
-  |
-8 |     &s
-  |     ^^ returns a reference to data owned by the current function
-
-Some errors have detailed explanations: E0106, E0515.
-For more information about an error, try `rustc --explain E0106`.
-error: could not compile `ownership` (bin "ownership") due to 2 previous errors
+For more information about this error, try `rustc --explain E0106`.
+error: could not compile `ownership` (bin "ownership") due to 1 previous error

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/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/option.rs:572:1
- ::: /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/option.rs:576:5
+ --> /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/option.rs:572:1
+ ::: /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/option.rs:576:5
   |
   = note: not covered
   = note: the matched value is of type `Option<i32>`

listings/ch09-error-handling/listing-09-10/output.txt

@@ -8,7 +8,6 @@ error[E0277]: the `?` operator can only be used in a function that returns `Resu
 4 |     let greeting_file = File::open("hello.txt")?;
   |                                                ^ cannot use the `?` operator in a function that returns `()`
   |
-  = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
 help: consider adding return type
   |
 3 ~ fn main() -> Result<(), Box<dyn std::error::Error>> {

listings/ch15-smart-pointers/listing-15-09/output.txt

@@ -4,7 +4,7 @@ error[E0614]: type `MyBox<{integer}>` cannot be dereferenced
   --> src/main.rs:14:19
    |
 14 |     assert_eq!(5, *y);
-   |                   ^^
+   |                   ^^ can't be dereferenced
 
 For more information about this error, try `rustc --explain E0614`.
 error: could not compile `deref-example` (bin "deref-example") due to 1 previous error

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/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/thread/mod.rs:723:1
+  --> /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/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/listing-20-07/output.txt

@@ -1,5 +1,4 @@
 $ cargo +nightly miri run
-Preparing a sysroot for Miri (target: aarch64-apple-darwin)... done
    Compiling unsafe-example v0.1.0 (file:///projects/unsafe-example)
     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.01s
      Running `file:///home/.rustup/toolchains/nightly/bin/cargo-miri runner target/miri/debug/unsafe-example`

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/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/thread/mod.rs:1886:17
+  --> /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/thread/mod.rs:1895:17
 
 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 @@
-1.86
+1.87

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 1.86.0 (released 2025-04-03)
+This version of the text assumes you’re using Rust 1.87.0 (released 2025-05-15)
 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