Update to Rust 1.88

.github/workflows/main.yml

@@ -12,8 +12,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.87 -c rust-docs
-        rustup default 1.87
+        rustup toolchain install 1.88 -c rust-docs
+        rustup default 1.88
     - name: Install mdbook
       run: |
         mkdir bin
@@ -47,8 +47,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.87 -c rust-docs
-        rustup default 1.87
+        rustup toolchain install 1.88 -c rust-docs
+        rustup default 1.88
     - 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/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/cmp.rs:975:8
+  --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/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/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/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/option.rs:572:1
- ::: /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/option.rs:576:5
+ --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/option.rs:589:1
+ ::: /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/option.rs:593:5
   |
   = note: not covered
   = note: the matched value is of type `Option<i32>`

listings/ch08-common-collections/listing-08-19/output.txt

@@ -6,11 +6,12 @@ error[E0277]: the type `str` cannot be indexed by `{integer}`
 3 |     let h = s1[0];
   |                ^ string indices are ranges of `usize`
   |
+  = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
   = note: you can use `.chars().nth()` or `.bytes().nth()`
           for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
-  = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
-          but trait `SliceIndex<[_]>` is implemented for `usize`
-  = help: for that trait implementation, expected `[_]`, found `str`
+  = help: the following other types implement trait `SliceIndex<T>`:
+            `usize` implements `SliceIndex<ByteStr>`
+            `usize` implements `SliceIndex<[T]>`
   = note: required for `String` to implement `Index<{integer}>`
 
 For more information about this error, try `rustc --explain E0277`.

listings/ch11-writing-automated-tests/no-listing-08-guess-with-bug/output.txt

@@ -9,7 +9,7 @@ test tests::greater_than_100 - should panic ... FAILED
 failures:
 
 ---- tests::greater_than_100 stdout ----
-note: test did not panic as expected
+note: test did not panic as expected at src/lib.rs:21:8
 
 failures:
     tests::greater_than_100

listings/ch11-writing-automated-tests/no-listing-09-guess-with-panic-msg-bug/output.txt

@@ -14,8 +14,8 @@ thread 'tests::greater_than_100' panicked at src/lib.rs:12:13:
 Guess value must be greater than or equal to 1, got 200.
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 note: panic did not contain expected string
-      panic message: `"Guess value must be greater than or equal to 1, got 200."`,
- expected substring: `"less than or equal to 100"`
+      panic message: "Guess value must be greater than or equal to 1, got 200."
+ expected substring: "less than or equal to 100"
 
 failures:
     tests::greater_than_100

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/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/thread/mod.rs:723:1
+  --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/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/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/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/thread/mod.rs:1895:17
+  --> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/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 @@
-1.87
+1.88

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 1.87.0 (released 2025-05-15)
+This version of the text assumes you’re using Rust 1.88.0 (released 2025-06-26)
 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