Update to Rust 1.55

.github/workflows/main.yml

@@ -12,8 +12,8 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install 1.54 -c rust-docs
-        rustup default 1.54
+        rustup toolchain install 1.55 -c rust-docs
+        rustup default 1.55
     - name: Install mdbook
       run: |
         mkdir bin

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

@@ -16,9 +16,5 @@ error[E0308]: mismatched types
    = note: expected reference `&String`
               found reference `&{integer}`
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `guessing_game`
-
-To learn more, run the command again with --verbose.
+error: could not compile `guessing_game` due to previous error

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

@@ -9,6 +9,5 @@ warning: unused `Result` that must be used
    = note: `#[warn(unused_must_use)]` on by default
    = note: this `Result` may be an `Err` variant, which should be handled
 
-warning: 1 warning emitted
-
+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

@@ -12,9 +12,5 @@ error[E0384]: cannot assign twice to immutable variable `x`
 4 |     x = 6;
   |     ^^^^^ cannot assign twice to immutable variable
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0384`.
-error: could not compile `variables`
-
-To learn more, run the command again with --verbose.
+error: could not compile `variables` due to previous error

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

@@ -6,9 +6,5 @@ error[E0308]: mismatched types
 3 |     spaces = spaces.len();
   |              ^^^^^^^^^^^^ expected `&str`, found `usize`
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `variables`
-
-To learn more, run the command again with --verbose.
+error: could not compile `variables` due to previous error

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

@@ -25,9 +25,6 @@ warning: unnecessary parentheses around assigned value
   |
   = note: `#[warn(unused_parens)]` on by default
 
-error: aborting due to 2 previous errors; 1 warning emitted
-
 For more information about this error, try `rustc --explain E0658`.
-error: could not compile `functions`
-
-To learn more, run the command again with --verbose.
+warning: `functions` (bin "functions") generated 1 warning
+error: could not compile `functions` due to 2 previous errors; 1 warning emitted

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

@@ -10,9 +10,5 @@ error[E0308]: mismatched types
 8 |     x + 1;
   |          - help: consider removing this semicolon
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `functions`
-
-To learn more, run the command again with --verbose.
+error: could not compile `functions` due to previous error

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

@@ -6,9 +6,5 @@ error[E0308]: mismatched types
 4 |     if number {
   |        ^^^^^^ expected `bool`, found integer
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `branches`
-
-To learn more, run the command again with --verbose.
+error: could not compile `branches` due to previous error

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

@@ -8,9 +8,5 @@ error[E0308]: `if` and `else` have incompatible types
   |                                 |
   |                                 expected because of this
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `branches`
-
-To learn more, run the command again with --verbose.
+error: could not compile `branches` due to previous error

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

@@ -6,9 +6,5 @@ error[E0282]: type annotations needed
 2 |     let guess = "42".parse().expect("Not a number!");
   |         ^^^^^ consider giving `guess` a type
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0282`.
-error: could not compile `no_type_annotations`
-
-To learn more, run the command again with --verbose.
+error: could not compile `no_type_annotations` due to previous error

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

@@ -8,9 +8,5 @@ error[E0596]: cannot borrow `*some_string` as mutable, as it is behind a `&` ref
 8 |     some_string.push_str(", world");
   |     ^^^^^^^^^^^ `some_string` is a `&` reference, so the data it refers to cannot be borrowed as mutable
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0596`.
-error: could not compile `ownership`
-
-To learn more, run the command again with --verbose.
+error: could not compile `ownership` due to previous error

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

@@ -11,9 +11,5 @@ error[E0382]: borrow of moved value: `s1`
 5 |     println!("{}, world!", s1);
   |                            ^^ value borrowed here after move
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0382`.
-error: could not compile `ownership`
-
-To learn more, run the command again with --verbose.
+error: could not compile `ownership` due to previous error

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

@@ -11,9 +11,5 @@ error[E0499]: cannot borrow `s` as mutable more than once at a time
 7 |     println!("{}, {}", r1, r2);
   |                        -- first borrow later used here
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0499`.
-error: could not compile `ownership`
-
-To learn more, run the command again with --verbose.
+error: could not compile `ownership` due to previous error

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

@@ -12,9 +12,5 @@ error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immuta
 8 |     println!("{}, {}, and {}", r1, r2, r3);
   |                                -- immutable borrow later used here
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0502`.
-error: could not compile `ownership`
-
-To learn more, run the command again with --verbose.
+error: could not compile `ownership` due to previous error

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

@@ -12,9 +12,5 @@ help: consider using the `'static` lifetime
 5 | fn dangle() -> &'static String {
   |                ^^^^^^^^
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0106`.
-error: could not compile `ownership`
-
-To learn more, run the command again with --verbose.
+error: could not compile `ownership` due to previous error

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

@@ -12,9 +12,5 @@ error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immuta
 20 |     println!("the first word is: {}", word);
    |                                       ---- immutable borrow later used here
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0502`.
-error: could not compile `ownership`
-
-To learn more, run the command again with --verbose.
+error: could not compile `ownership` due to previous error

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

@@ -8,12 +8,7 @@ error[E0277]: `Rectangle` doesn't implement `std::fmt::Display`
    |
    = 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
-   = note: required by `std::fmt::Display::fmt`
    = note: this error originates in the macro `$crate::format_args_nl` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `rectangles`
-
-To learn more, run the command again with --verbose.
+error: could not compile `rectangles` due to previous error

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

@@ -1,33 +1,31 @@
 $ cargo run
    Compiling structs v0.1.0 (file:///projects/structs)
 error[E0106]: missing lifetime specifier
- --> src/main.rs:2:15
+ --> src/main.rs:3:15
   |
-2 |     username: &str,
+3 |     username: &str,
   |               ^ expected named lifetime parameter
   |
 help: consider introducing a named lifetime parameter
   |
 1 | struct User<'a> {
-2 |     username: &'a str,
+2 |     active: bool,
+3 |     username: &'a str,
   |
 
 error[E0106]: missing lifetime specifier
- --> src/main.rs:3:12
+ --> src/main.rs:4:12
   |
-3 |     email: &str,
+4 |     email: &str,
   |            ^ expected named lifetime parameter
   |
 help: consider introducing a named lifetime parameter
   |
 1 | struct User<'a> {
-2 |     username: &str,
-3 |     email: &'a str,
+2 |     active: bool,
+3 |     username: &str,
+4 |     email: &'a str,
   |
 
-error: aborting due to 2 previous errors
-
 For more information about this error, try `rustc --explain E0106`.
-error: could not compile `structs`
-
-To learn more, run the command again with --verbose.
+error: could not compile `structs` due to 2 previous errors

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

@@ -7,13 +7,8 @@ error[E0277]: `Rectangle` doesn't implement `Debug`
    |                               ^^^^^ `Rectangle` cannot be formatted using `{:?}`
    |
    = help: the trait `Debug` is not implemented for `Rectangle`
-   = note: add `#[derive(Debug)]` or manually implement `Debug`
-   = note: required by `std::fmt::Debug::fmt`
+   = note: add `#[derive(Debug)]` to `Rectangle` or manually `impl Debug for Rectangle`
    = note: this error originates in the macro `$crate::format_args_nl` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `rectangles`
-
-To learn more, run the command again with --verbose.
+error: could not compile `rectangles` due to previous error

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

@@ -8,9 +8,5 @@ error[E0277]: cannot add `Option<i8>` to `i8`
   |
   = help: the trait `Add<Option<i8>>` is not implemented for `i8`
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `enums`
-
-To learn more, run the command again with --verbose.
+error: could not compile `enums` due to previous error

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

@@ -9,9 +9,5 @@ error[E0004]: non-exhaustive patterns: `None` not covered
     = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
     = note: the matched value is of type `Option<i32>`
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0004`.
-error: could not compile `enums`
-
-To learn more, run the command again with --verbose.
+error: could not compile `enums` due to previous error

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

@@ -24,9 +24,5 @@ note: the module `hosting` is defined here
 2  |     mod hosting {
    |     ^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
-
 For more information about this error, try `rustc --explain E0603`.
-error: could not compile `restaurant`
-
-To learn more, run the command again with --verbose.
+error: could not compile `restaurant` due to 2 previous errors

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

@@ -24,9 +24,5 @@ note: the function `add_to_waitlist` is defined here
 3  |         fn add_to_waitlist() {}
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
-
 For more information about this error, try `rustc --explain E0603`.
-error: could not compile `restaurant`
-
-To learn more, run the command again with --verbose.
+error: could not compile `restaurant` due to 2 previous errors

listings/ch08-common-collections/listing-08-07/output.txt

@@ -12,9 +12,5 @@ error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immuta
 8 |     println!("The first element is: {}", first);
   |                                          ----- immutable borrow later used here
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0502`.
-error: could not compile `collections`
-
-To learn more, run the command again with --verbose.
+error: could not compile `collections` due to previous error

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

@@ -8,9 +8,5 @@ error[E0277]: the type `String` cannot be indexed by `{integer}`
   |
   = help: the trait `Index<{integer}>` is not implemented for `String`
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `collections`
-
-To learn more, run the command again with --verbose.
+error: could not compile `collections` due to previous error

listings/ch09-error-handling/no-listing-02-ask-compiler-for-type/output.txt

@@ -11,9 +11,5 @@ error[E0308]: mismatched types
   = note: expected type `u32`
              found enum `Result<File, std::io::Error>`
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `error-handling`
-
-To learn more, run the command again with --verbose.
+error: could not compile `error-handling` due to previous error

listings/ch09-error-handling/no-listing-06-question-mark-in-main/output.txt

@@ -1,20 +1,16 @@
 $ cargo run
    Compiling error-handling v0.1.0 (file:///projects/error-handling)
 error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
- --> src/main.rs:4:36
-  |
-3 | / fn main() {
-4 | |     let f = File::open("hello.txt")?;
-  | |                                    ^ cannot use the `?` operator in a function that returns `()`
-5 | | }
-  | |_- this function should return `Result` or `Option` to accept `?`
-  |
-  = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
-  = note: required by `from_residual`
-
-error: aborting due to previous error
+   --> src/main.rs:4:36
+    |
+3   | / fn main() {
+4   | |     let f = File::open("hello.txt")?;
+    | |                                    ^ cannot use the `?` operator in a function that returns `()`
+5   | | }
+    | |_- this function should return `Result` or `Option` to accept `?`
+    |
+    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
+note: required by `from_residual`
 
 For more information about this error, try `rustc --explain E0277`.
-error: could not compile `error-handling`
-
-To learn more, run the command again with --verbose.
+error: could not compile `error-handling` due to previous error

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

@@ -13,9 +13,5 @@ help: consider restricting type parameter `T`
 1 | fn largest<T: std::cmp::PartialOrd>(list: &[T]) -> T {
   |             ^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0369`.
-error: could not compile `chapter10`
-
-To learn more, run the command again with --verbose.
+error: could not compile `chapter10` due to previous error

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

@@ -6,9 +6,5 @@ error[E0308]: mismatched types
 7 |     let wont_work = Point { x: 5, y: 4.0 };
   |                                      ^^^ expected integer, found floating-point number
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0308`.
-error: could not compile `chapter10`
-
-To learn more, run the command again with --verbose.
+error: could not compile `chapter10` due to previous error

listings/ch10-generic-types-traits-and-lifetimes/listing-10-17/output.txt

@@ -11,9 +11,5 @@ error[E0597]: `x` does not live long enough
 10 |         println!("r: {}", r);
    |                           - borrow later used here
 
-error: aborting due to previous error
-
 For more information about this error, try `rustc --explain E0597`.
-error: could not compile `chapter10`
-
-To learn more, run the command again with --verbose.
+error: could not compile `chapter10` due to previous error