Update to Rust 1.70

.github/workflows/main.yml

@@ -12,8 +12,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.69 -c rust-docs
-        rustup default 1.69
+        rustup toolchain install 1.70 -c rust-docs
+        rustup default 1.70
     - name: Install mdbook
       run: |
         mkdir bin

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

@@ -18,10 +18,10 @@ error[E0308]: mismatched types
     = note: expected reference `&String`
                found reference `&{integer}`
 note: method defined here
-   --> /Users/carolnichols/.rustup/toolchains/1.69-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/cmp.rs:783:8
+   --> /Users/carolnichols/.rustup/toolchains/1.70-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/cmp.rs:784:8
     |
-783 |     fn cmp(&self, other: &Self) -> Ordering;
+784 |     fn cmp(&self, other: &Self) -> Ordering;
     |        ^^^
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `guessing_game` due to previous error
+error: could not compile `guessing_game` (bin "guessing_game") due to previous error

listings/ch02-guessing-game-tutorial/no-listing-02-without-expect/output.txt

@@ -8,6 +8,10 @@ warning: unused `Result` that must be used
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
+help: use `let _ = ...` to ignore the resulting value
+   |
+10 |     let _ = io::stdin().read_line(&mut guess);
+   |     +++++++
 
 warning: `guessing_game` (bin "guessing_game") generated 1 warning
     Finished dev [unoptimized + debuginfo] target(s) in 0.59s

listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/output.txt

@@ -13,4 +13,4 @@ error[E0384]: cannot assign twice to immutable variable `x`
   |     ^^^^^ cannot assign twice to immutable variable
 
 For more information about this error, try `rustc --explain E0384`.
-error: could not compile `variables` due to previous error
+error: could not compile `variables` (bin "variables") due to previous error

listings/ch03-common-programming-concepts/no-listing-05-mut-cant-change-types/output.txt

@@ -15,4 +15,4 @@ help: try removing the method call
   |
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `variables` due to previous error
+error: could not compile `variables` (bin "variables") due to previous error

listings/ch03-common-programming-concepts/no-listing-19-statements-vs-expressions/output.txt

@@ -37,4 +37,4 @@ help: remove these parentheses
 
 For more information about this error, try `rustc --explain E0658`.
 warning: `functions` (bin "functions") generated 1 warning
-error: could not compile `functions` due to 3 previous errors; 1 warning emitted
+error: could not compile `functions` (bin "functions") due to 3 previous errors; 1 warning emitted

listings/ch03-common-programming-concepts/no-listing-23-statements-dont-return-values/output.txt

@@ -11,4 +11,4 @@ error[E0308]: mismatched types
   |          - help: remove this semicolon to return this value
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `functions` due to previous error
+error: could not compile `functions` (bin "functions") due to previous error

listings/ch03-common-programming-concepts/no-listing-28-if-condition-must-be-bool/output.txt

@@ -7,4 +7,4 @@ error[E0308]: mismatched types
   |        ^^^^^^ expected `bool`, found integer
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `branches` due to previous error
+error: could not compile `branches` (bin "branches") due to previous error

listings/ch03-common-programming-concepts/no-listing-31-arms-must-return-same-type/output.txt

@@ -9,4 +9,4 @@ error[E0308]: `if` and `else` have incompatible types
   |                                 expected because of this
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `branches` due to previous error
+error: could not compile `branches` (bin "branches") due to previous error

listings/ch03-common-programming-concepts/output-only-01-no-type-annotations/output.txt

@@ -12,4 +12,4 @@ help: consider giving `guess` an explicit type
   |              ++++++++++++
 
 For more information about this error, try `rustc --explain E0282`.
-error: could not compile `no_type_annotations` due to previous error
+error: could not compile `no_type_annotations` (bin "no_type_annotations") due to previous error

listings/ch04-understanding-ownership/listing-04-06/output.txt

@@ -12,4 +12,4 @@ help: consider changing this to be a mutable reference
   |                        ~~~~~~~~~~~
 
 For more information about this error, try `rustc --explain E0596`.
-error: could not compile `ownership` due to previous error
+error: could not compile `ownership` (bin "ownership") due to previous error

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

@@ -18,4 +18,4 @@ help: consider cloning the value if the performance cost is acceptable
   |                ++++++++
 
 For more information about this error, try `rustc --explain E0382`.
-error: could not compile `ownership` due to previous error
+error: could not compile `ownership` (bin "ownership") due to previous error

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

@@ -12,4 +12,4 @@ error[E0499]: cannot borrow `s` as mutable more than once at a time
   |                        -- first borrow later used here
 
 For more information about this error, try `rustc --explain E0499`.
-error: could not compile `ownership` due to previous error
+error: could not compile `ownership` (bin "ownership") due to previous error

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

@@ -13,4 +13,4 @@ error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immuta
   |                                -- immutable borrow later used here
 
 For more information about this error, try `rustc --explain E0502`.
-error: could not compile `ownership` due to previous error
+error: could not compile `ownership` (bin "ownership") due to previous error

listings/ch04-understanding-ownership/no-listing-14-dangling-reference/output.txt

@@ -13,4 +13,4 @@ help: consider using the `'static` lifetime
   |                 +++++++
 
 For more information about this error, try `rustc --explain E0106`.
-error: could not compile `ownership` due to previous error
+error: could not compile `ownership` (bin "ownership") due to previous error

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

@@ -13,4 +13,4 @@ error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immuta
    |                                       ---- immutable borrow later used here
 
 For more information about this error, try `rustc --explain E0502`.
-error: could not compile `ownership` due to previous error
+error: could not compile `ownership` (bin "ownership") due to previous error

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

@@ -11,4 +11,4 @@ error[E0277]: `Rectangle` doesn't implement `std::fmt::Display`
    = 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)
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `rectangles` due to previous error
+error: could not compile `rectangles` (bin "rectangles") due to previous error

listings/ch05-using-structs-to-structure-related-data/no-listing-02-reference-in-struct/output.txt

@@ -28,4 +28,4 @@ help: consider introducing a named lifetime parameter
   |
 
 For more information about this error, try `rustc --explain E0106`.
-error: could not compile `structs` due to 2 previous errors
+error: could not compile `structs` (bin "structs") due to 2 previous errors

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

@@ -11,8 +11,9 @@ 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)]
+1  + #[derive(Debug)]
+2  | struct Rectangle {
    |
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `rectangles` due to previous error
+error: could not compile `rectangles` (bin "rectangles") due to previous error

listings/ch06-enums-and-pattern-matching/no-listing-07-cant-use-option-directly/output.txt

@@ -14,4 +14,4 @@ error[E0277]: cannot add `Option<i8>` to `i8`
             <i8 as Add>
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `enums` due to previous error
+error: could not compile `enums` (bin "enums") due to previous error

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

@@ -7,12 +7,12 @@ error[E0004]: non-exhaustive patterns: `None` not covered
     |               ^ pattern `None` not covered
     |
 note: `Option<i32>` defined here
-   --> /Users/carolnichols/.rustup/toolchains/1.69-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/option.rs:567:5
+   --> /Users/carolnichols/.rustup/toolchains/1.70-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/option.rs:568:5
     |
-563 | pub enum Option<T> {
+564 | pub enum Option<T> {
     | ------------------
 ...
-567 |     None,
+568 |     None,
     |     ^^^^ not covered
     = note: the matched value is of type `Option<i32>`
 help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
@@ -22,4 +22,4 @@ help: ensure that all possible cases are being handled by adding a match arm wit
     |
 
 For more information about this error, try `rustc --explain E0004`.
-error: could not compile `enums` due to previous error
+error: could not compile `enums` (bin "enums") due to previous error

listings/ch07-managing-growing-projects/listing-07-03/output.txt

@@ -25,4 +25,4 @@ note: the module `hosting` is defined here
    |     ^^^^^^^^^^^
 
 For more information about this error, try `rustc --explain E0603`.
-error: could not compile `restaurant` due to 2 previous errors
+error: could not compile `restaurant` (lib) due to 2 previous errors

listings/ch07-managing-growing-projects/listing-07-05/output.txt

@@ -25,4 +25,4 @@ note: the function `add_to_waitlist` is defined here
    |         ^^^^^^^^^^^^^^^^^^^^
 
 For more information about this error, try `rustc --explain E0603`.
-error: could not compile `restaurant` due to 2 previous errors
+error: could not compile `restaurant` (lib) due to 2 previous errors

listings/ch07-managing-growing-projects/listing-07-12/output.txt

@@ -16,4 +16,4 @@ error[E0433]: failed to resolve: use of undeclared crate or module `hosting`
 
 For more information about this error, try `rustc --explain E0433`.
 warning: `restaurant` (lib) generated 1 warning
-error: could not compile `restaurant` due to previous error; 1 warning emitted
+error: could not compile `restaurant` (lib) due to previous error; 1 warning emitted

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` due to previous error
+error: could not compile `collections` (bin "collections") due to previous error

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

@@ -16,4 +16,4 @@ error[E0277]: the type `String` cannot be indexed by `{integer}`
             <String as Index<std::ops::Range<usize>>>
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `collections` due to previous error
+error: could not compile `collections` (bin "collections") due to previous error

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

@@ -11,4 +11,4 @@ error[E0277]: the `?` operator can only be used in a function that returns `Resu
   = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `error-handling` due to previous error
+error: could not compile `error-handling` (bin "error-handling") due to previous error

listings/ch10-generic-types-traits-and-lifetimes/listing-10-05/output.txt

@@ -14,4 +14,4 @@ help: consider restricting type parameter `T`
   |             ++++++++++++++++++++++
 
 For more information about this error, try `rustc --explain E0369`.
-error: could not compile `chapter10` due to previous error
+error: could not compile `chapter10` (bin "chapter10") due to previous error

listings/ch10-generic-types-traits-and-lifetimes/listing-10-07/output.txt

@@ -7,4 +7,4 @@ error[E0308]: mismatched types
   |                                      ^^^ expected integer, found floating-point number
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `chapter10` due to previous error
+error: could not compile `chapter10` (bin "chapter10") due to previous error

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

@@ -14,4 +14,4 @@ error[E0597]: `x` does not live long enough
   |                       - borrow later used here
 
 For more information about this error, try `rustc --explain E0597`.
-error: could not compile `chapter10` due to previous error
+error: could not compile `chapter10` (bin "chapter10") due to previous error

listings/ch10-generic-types-traits-and-lifetimes/listing-10-20/output.txt

@@ -13,4 +13,4 @@ help: consider introducing a named lifetime parameter
   |           ++++     ++          ++          ++
 
 For more information about this error, try `rustc --explain E0106`.
-error: could not compile `chapter10` due to previous error
+error: could not compile `chapter10` (bin "chapter10") due to previous error

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

@@ -13,4 +13,4 @@ error[E0597]: `string2` does not live long enough
   |                                          ------ borrow later used here
 
 For more information about this error, try `rustc --explain E0597`.
-error: could not compile `chapter10` due to previous error
+error: could not compile `chapter10` (bin "chapter10") due to previous error

listings/ch10-generic-types-traits-and-lifetimes/no-listing-09-unrelated-lifetime/output.txt

@@ -7,4 +7,4 @@ error[E0515]: cannot return reference to local variable `result`
    |     ^^^^^^^^^^^^^^^ returns a reference to data owned by the current function
 
 For more information about this error, try `rustc --explain E0515`.
-error: could not compile `chapter10` due to previous error
+error: could not compile `chapter10` (bin "chapter10") due to previous error

listings/ch12-an-io-project/listing-12-12/output.txt

@@ -8,6 +8,10 @@ warning: unused `Result` that must be used
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
+help: use `let _ = ...` to ignore the resulting value
+   |
+19 |     let _ = run(config);
+   |     +++++++
 
 warning: `minigrep` (bin "minigrep") generated 1 warning
     Finished dev [unoptimized + debuginfo] target(s) in 0.71s

listings/ch12-an-io-project/output-only-02-missing-lifetimes/output.txt

@@ -13,4 +13,4 @@ help: consider introducing a named lifetime parameter
    |              ++++         ++                 ++              ++
 
 For more information about this error, try `rustc --explain E0106`.
-error: could not compile `minigrep` due to previous error
+error: could not compile `minigrep` (lib) due to previous error

listings/ch13-functional-features/listing-13-03/output.txt

@@ -16,4 +16,4 @@ note: closure parameter defined here
   |                            ^
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `closure-example` due to previous error
+error: could not compile `closure-example` (bin "closure-example") due to previous error

listings/ch13-functional-features/listing-13-08/output.txt

@@ -12,4 +12,4 @@ error[E0507]: cannot move out of `value`, a captured variable in an `FnMut` clos
    |                              ^^^^^ move occurs because `value` has type `String`, which does not implement the `Copy` trait
 
 For more information about this error, try `rustc --explain E0507`.
-error: could not compile `rectangles` due to previous error
+error: could not compile `rectangles` (bin "rectangles") due to previous error

listings/ch13-functional-features/listing-13-14/output.txt

@@ -8,6 +8,10 @@ warning: unused `Map` that must be used
   |
   = note: iterators are lazy and do nothing unless consumed
   = note: `#[warn(unused_must_use)]` on by default
+help: use `let _ = ...` to ignore the resulting value
+  |
+4 |     let _ = v1.iter().map(|x| x + 1);
+  |     +++++++
 
 warning: `iterators` (bin "iterators") generated 1 warning
     Finished dev [unoptimized + debuginfo] target(s) in 0.47s

listings/ch15-smart-pointers/listing-15-03/output.txt

@@ -14,4 +14,4 @@ help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
   |               ++++    +
 
 For more information about this error, try `rustc --explain E0072`.
-error: could not compile `cons-list` due to previous error
+error: could not compile `cons-list` (bin "cons-list") due to previous error

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

@@ -7,4 +7,4 @@ error[E0614]: type `MyBox<{integer}>` cannot be dereferenced
    |                   ^^
 
 For more information about this error, try `rustc --explain E0614`.
-error: could not compile `deref-example` due to previous error
+error: could not compile `deref-example` (bin "deref-example") due to previous error

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

@@ -10,4 +10,4 @@ error[E0040]: explicit use of destructor method
    |     help: consider using `drop` function: `drop(c)`
 
 For more information about this error, try `rustc --explain E0040`.
-error: could not compile `drop-example` due to previous error
+error: could not compile `drop-example` (bin "drop-example") due to previous error

listings/ch15-smart-pointers/listing-15-17/output.txt

@@ -11,4 +11,4 @@ error[E0382]: use of moved value: `a`
    |                              ^ value used here after move
 
 For more information about this error, try `rustc --explain E0382`.
-error: could not compile `cons-list` due to previous error
+error: could not compile `cons-list` (bin "cons-list") due to previous error

listings/ch15-smart-pointers/listing-15-21/output.txt

@@ -12,5 +12,5 @@ help: consider changing that to be a mutable reference
    |             ~~~~~~~~~
 
 For more information about this error, try `rustc --explain E0596`.
-error: could not compile `limit-tracker` due to previous error
+error: could not compile `limit-tracker` (lib test) due to previous error
 warning: build failed, waiting for other jobs to finish...

listings/ch15-smart-pointers/no-listing-01-cant-borrow-immutable-as-mutable/output.txt

@@ -12,4 +12,4 @@ help: consider changing this to be mutable
   |         +++
 
 For more information about this error, try `rustc --explain E0596`.
-error: could not compile `borrowing` due to previous error
+error: could not compile `borrowing` (bin "borrowing") due to previous error

listings/ch15-smart-pointers/output-only-01-comparing-to-reference/output.txt

@@ -20,4 +20,4 @@ error[E0277]: can't compare `{integer}` with `&{integer}`
   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `deref-example` due to previous error
+error: could not compile `deref-example` (bin "deref-example") due to previous error

listings/ch16-fearless-concurrency/listing-16-03/output.txt

@@ -22,4 +22,4 @@ help: to force the closure to take ownership of `v` (and any other referenced va
   |                                ++++
 
 For more information about this error, try `rustc --explain E0373`.
-error: could not compile `threads` due to previous error
+error: could not compile `threads` (bin "threads") due to previous error

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

@@ -13,4 +13,4 @@ error[E0382]: borrow of moved value: `val`
    = 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)
 
 For more information about this error, try `rustc --explain E0382`.
-error: could not compile `message-passing` due to previous error
+error: could not compile `message-passing` (bin "message-passing") due to previous error

listings/ch16-fearless-concurrency/listing-16-13/output.txt

@@ -12,4 +12,4 @@ error[E0382]: use of moved value: `counter`
    |                           ------- use occurs due to use in closure
 
 For more information about this error, try `rustc --explain E0382`.
-error: could not compile `shared-state` due to previous error
+error: could not compile `shared-state` (bin "shared-state") due to previous error

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

@@ -22,10 +22,10 @@ note: required because it's used within this closure
 11  |         let handle = thread::spawn(move || {
     |                                    ^^^^^^^
 note: required by a bound in `spawn`
-   --> /Users/carolnichols/.rustup/toolchains/1.69-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/thread/mod.rs:714:8
+   --> /Users/carolnichols/.rustup/toolchains/1.70-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/thread/mod.rs:680:8
     |
-714 |     F: Send + 'static,
+680 |     F: Send + 'static,
     |        ^^^^ required by this bound in `spawn`
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `shared-state` due to previous error
+error: could not compile `shared-state` (bin "shared-state") due to previous error

listings/ch16-fearless-concurrency/output-only-01-move-drop/output.txt

@@ -15,4 +15,4 @@ error[E0382]: use of moved value: `v`
    |          ^ value used here after move
 
 For more information about this error, try `rustc --explain E0382`.
-error: could not compile `threads` due to previous error
+error: could not compile `threads` (bin "threads") due to previous error

listings/ch17-oop/listing-17-10/output.txt

@@ -10,4 +10,4 @@ error[E0277]: the trait bound `String: Draw` is not satisfied
   = note: required for the cast from `String` to the object type `dyn Draw`
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `gui` due to previous error
+error: could not compile `gui` (bin "gui") due to previous error

listings/ch18-patterns-and-matching/listing-18-05/output.txt

@@ -12,4 +12,4 @@ error[E0308]: mismatched types
              found tuple `(_, _)`
 
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `patterns` due to previous error
+error: could not compile `patterns` (bin "patterns") due to previous error