[INFO] cloning repository https://github.com/sdobz/rust-follow-along
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sdobz/rust-follow-along" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsdobz%2Frust-follow-along", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsdobz%2Frust-follow-along'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 15471338aa916f44df49638cd48fa6ff21536e5e
[INFO] checking sdobz/rust-follow-along against c397dae808f70caebab1fc4e11b3edf7e59f58c7 for pr-158759-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsdobz%2Frust-follow-along" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sdobz/rust-follow-along
[INFO] finished tweaking git repo https://github.com/sdobz/rust-follow-along
[INFO] tweaked toml for git repo https://github.com/sdobz/rust-follow-along written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sdobz/rust-follow-along on toolchain c397dae808f70caebab1fc4e11b3edf7e59f58c7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c397dae808f70caebab1fc4e11b3edf7e59f58c7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/sdobz/rust-follow-along already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c397dae808f70caebab1fc4e11b3edf7e59f58c7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: ch19_advancedfeatures/Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: `ch19_advacedfeatures` (manifest) generated 1 warning
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand v0.3.22
[INFO] [stderr]   Downloaded bitflags v1.0.4
[INFO] [stderr]   Downloaded rand v0.4.3
[INFO] [stderr]   Downloaded libc v0.2.43
[INFO] [stderr]   Downloaded winapi v0.3.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28
[INFO] running `Command { std: "docker" "start" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28" "/opt/rustwide/cargo-home/bin/cargo" "+c397dae808f70caebab1fc4e11b3edf7e59f58c7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28" "/opt/rustwide/cargo-home/bin/cargo" "+c397dae808f70caebab1fc4e11b3edf7e59f58c7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: ch19_advancedfeatures/Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: `ch19_advacedfeatures` (manifest) generated 1 warning
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking ch20_webserver v0.1.0 (/opt/rustwide/workdir/ch20_webserver)
[INFO] [stderr]     Checking ch17_objectoriented v0.1.0 (/opt/rustwide/workdir/ch17_objectoriented)
[INFO] [stderr]     Checking ch07_modules v0.1.0 (/opt/rustwide/workdir/ch07_modules)
[INFO] [stderr]     Checking ch12_minigrep v0.1.0 (/opt/rustwide/workdir/ch12_minigrep)
[INFO] [stderr]     Checking ch13b_minigrep2 v0.1.0 (/opt/rustwide/workdir/ch13b_minigrep2)
[INFO] [stderr]     Checking ch11_tests v0.1.0 (/opt/rustwide/workdir/ch11_tests)
[INFO] [stderr]     Checking ch10_generics v0.1.0 (/opt/rustwide/workdir/ch10_generics)
[INFO] [stderr]     Checking ch18_patterns v0.1.0 (/opt/rustwide/workdir/ch18_patterns)
[INFO] [stderr]     Checking ch06_enums v0.1.0 (/opt/rustwide/workdir/ch06_enums)
[INFO] [stderr]     Checking ch03b_functions v0.1.0 (/opt/rustwide/workdir/ch03b_functions)
[INFO] [stderr]     Checking ch01_getting_started v0.1.0 (/opt/rustwide/workdir/ch01_getting_started)
[INFO] [stderr]     Checking ch05_structs v0.1.0 (/opt/rustwide/workdir/ch05_structs)
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> ch18_patterns/src/main.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         'a' ... 'j' => println!("Early ASCII letter"),
[INFO] [stdout]    |             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> ch18_patterns/src/main.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         'k' ... 'z' => println!("Late ASCII letter"),
[INFO] [stdout]    |             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> ch18_patterns/src/main.rs:221:50
[INFO] [stdout]     |
[INFO] [stdout] 221 |         HelloMessage::Hello { id: id_variable @ 3...7 } => {
[INFO] [stdout]     |                                                  ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> ch18_patterns/src/main.rs:225:37
[INFO] [stdout]     |
[INFO] [stdout] 225 |         HelloMessage::Hello { id: 10...12 } => {
[INFO] [stdout]     |                                     ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> ch11_tests/src/lib.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct Guess {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 22 |     value: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> ch10_generics/src/traits.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 37 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> ch10_generics/src/traits.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 51 |     pub username: String,
[INFO] [stdout] 52 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 53 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 54 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alaska` is never constructed
[INFO] [stdout]   --> ch06_enums/src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | enum UsState {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] 29 |     Alabama,
[INFO] [stdout] 30 |     Alaska,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `setting_value` is never read
[INFO] [stdout]    --> ch18_patterns/src/main.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 |             setting_value = new_setting_value;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]   --> ch06_enums/src/main.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | enum Coin {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 35 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 36 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 37 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Coin` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `y` and `z` are never read
[INFO] [stdout]    --> ch18_patterns/src/main.rs:257:5
[INFO] [stdout]     |
[INFO] [stdout] 255 | struct Point3D {
[INFO] [stdout]     |        ------- fields in this struct
[INFO] [stdout] 256 |     x: i32,
[INFO] [stdout] 257 |     y: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout] 258 |     z: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> ch18_patterns/src/main.rs:262:5
[INFO] [stdout]     |
[INFO] [stdout] 261 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 262 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 263 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 264 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> ch18_patterns/src/main.rs:269:5
[INFO] [stdout]     |
[INFO] [stdout] 268 | enum Color {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] 269 |     Rgb(i32, i32, i32),
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> ch17_objectoriented/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout]  9 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 10 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch19_advacedfeatures v0.1.0 (/opt/rustwide/workdir/ch19_advancedfeatures)
[INFO] [stderr]     Checking ch04b_slices v0.1.0 (/opt/rustwide/workdir/ch04b_slices)
[INFO] [stderr]     Checking ch04a_ownership v0.1.0 (/opt/rustwide/workdir/ch04a_ownership)
[INFO] [stderr]     Checking ch09_errors v0.1.0 (/opt/rustwide/workdir/ch09_errors)
[INFO] [stderr]     Checking ch03a_variables v0.1.0 (/opt/rustwide/workdir/ch03a_variables)
[INFO] [stderr]     Checking ch03c_branches v0.1.0 (/opt/rustwide/workdir/ch03c_branches)
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> ch17_objectoriented/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  8 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout]  9 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 10 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch08_collections v0.1.0 (/opt/rustwide/workdir/ch08_collections)
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> ch11_tests/src/lib.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct Guess {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 22 |     value: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Context` is never constructed
[INFO] [stdout]  --> ch19_advancedfeatures/src/lifetimes.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Context<'s>(&'s str);
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Parser` is never constructed
[INFO] [stdout]  --> ch19_advancedfeatures/src/lifetimes.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Parser<'c, 's: 'c> {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `parse` is never used
[INFO] [stdout]  --> ch19_advancedfeatures/src/lifetimes.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl<'c, 's> Parser<'c, 's> {
[INFO] [stdout]   | --------------------------- method in this implementation
[INFO] [stdout] 9 |     fn parse(&self) -> Result<(), &'s str> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_context` is never used
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `diameter` is never read
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Ball<'a> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 21 |     diameter: &'a i32,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StrWrap` is never constructed
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct StrWrap<'a>(&'a str);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn foo<'a>(string: &'a str) -> StrWrap<'a> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo_anon_lifetime` is never used
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn foo_anon_lifetime(string: &str) -> StrWrap<'_> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:14:27
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]    |                           ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           the lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]    |                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> ch18_patterns/src/main.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         'a' ... 'j' => println!("Early ASCII letter"),
[INFO] [stdout]    |             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> ch18_patterns/src/main.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         'k' ... 'z' => println!("Late ASCII letter"),
[INFO] [stdout]    |             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> ch18_patterns/src/main.rs:221:50
[INFO] [stdout]     |
[INFO] [stdout] 221 |         HelloMessage::Hello { id: id_variable @ 3...7 } => {
[INFO] [stdout]     |                                                  ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> ch18_patterns/src/main.rs:225:37
[INFO] [stdout]     |
[INFO] [stdout] 225 |         HelloMessage::Hello { id: 10...12 } => {
[INFO] [stdout]     |                                     ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]   --> ch19_advancedfeatures/src/unsafe_demo.rs:41:40
[INFO] [stdout]    |
[INFO] [stdout] 41 |         println!("Counter is now: {}", COUNTER);
[INFO] [stdout]    |                                        ^^^^^^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]    = note: `#[warn(static_mut_refs)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch16_concurrency v0.1.0 (/opt/rustwide/workdir/ch16_concurrency)
[INFO] [stderr]     Checking ch15_smartpointers v0.1.0 (/opt/rustwide/workdir/ch15_smartpointers)
[INFO] [stderr]     Checking ch13a_functional v0.1.0 (/opt/rustwide/workdir/ch13a_functional)
[INFO] [stdout] warning: constant `MAX_POINTS` is never used
[INFO] [stdout]  --> ch03a_variables/src/main.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | const MAX_POINTS: u128 = 200_000;
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `setting_value` is never read
[INFO] [stdout]    --> ch18_patterns/src/main.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout] 148 |             setting_value = new_setting_value;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `y` and `z` are never read
[INFO] [stdout]    --> ch18_patterns/src/main.rs:257:5
[INFO] [stdout]     |
[INFO] [stdout] 255 | struct Point3D {
[INFO] [stdout]     |        ------- fields in this struct
[INFO] [stdout] 256 |     x: i32,
[INFO] [stdout] 257 |     y: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout] 258 |     z: i32,
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> ch18_patterns/src/main.rs:262:5
[INFO] [stdout]     |
[INFO] [stdout] 261 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 262 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 263 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 264 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> ch18_patterns/src/main.rs:269:5
[INFO] [stdout]     |
[INFO] [stdout] 268 | enum Color {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] 269 |     Rgb(i32, i32, i32),
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alaska` is never constructed
[INFO] [stdout]   --> ch06_enums/src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | enum UsState {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] 29 |     Alabama,
[INFO] [stdout] 30 |     Alaska,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]   --> ch06_enums/src/main.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | enum Coin {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 35 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 36 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 37 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Coin` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> ch10_generics/src/traits.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 37 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> ch10_generics/src/traits.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 51 |     pub username: String,
[INFO] [stdout] 52 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 53 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 54 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Context` is never constructed
[INFO] [stdout]  --> ch19_advancedfeatures/src/lifetimes.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Context<'s>(&'s str);
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Parser` is never constructed
[INFO] [stdout]  --> ch19_advancedfeatures/src/lifetimes.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Parser<'c, 's: 'c> {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `parse` is never used
[INFO] [stdout]  --> ch19_advancedfeatures/src/lifetimes.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl<'c, 's> Parser<'c, 's> {
[INFO] [stdout]   | --------------------------- method in this implementation
[INFO] [stdout] 9 |     fn parse(&self) -> Result<(), &'s str> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_context` is never used
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `diameter` is never read
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Ball<'a> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 21 |     diameter: &'a i32,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StrWrap` is never constructed
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct StrWrap<'a>(&'a str);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn foo<'a>(string: &'a str) -> StrWrap<'a> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo_anon_lifetime` is never used
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn foo_anon_lifetime(string: &str) -> StrWrap<'_> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch19_advancedfeatures/src/lifetimes.rs:14:27
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]    |                           ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           the lifetime is hidden here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]    |                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]   --> ch19_advancedfeatures/src/unsafe_demo.rs:41:40
[INFO] [stdout]    |
[INFO] [stdout] 41 |         println!("Counter is now: {}", COUNTER);
[INFO] [stdout]    |                                        ^^^^^^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]    = note: `#[warn(static_mut_refs)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_POINTS` is never used
[INFO] [stdout]  --> ch03a_variables/src/main.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | const MAX_POINTS: u128 = 200_000;
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:45:10
[INFO] [stdout]    |
[INFO] [stdout] 45 |     Cons(Rc<RefCell<i32>>, Rc<RcRefCellList>),
[INFO] [stdout]    |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RcRefCellList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 -     Cons(Rc<RefCell<i32>>, Rc<RcRefCellList>),
[INFO] [stdout] 45 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:51:10
[INFO] [stdout]    |
[INFO] [stdout] 51 |     Cons(i32, RefCell<Rc<TailList>>),
[INFO] [stdout]    |     ---- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TailList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 51 -     Cons(i32, RefCell<Rc<TailList>>),
[INFO] [stdout] 51 +     Cons((), RefCell<Rc<TailList>>),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15_smartpointers/src/refcount.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Cons(i32, Rc<RcList>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `RcList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 5 -     Cons(i32, Rc<RcList>),
[INFO] [stdout] 5 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]  --> ch15_smartpointers/src/weakrc.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:15:27
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]    |                           ^^                 ^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]   --> ch13a_functional/src/iterators.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct Shoe {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]   --> ch13a_functional/src/iterators.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Counter {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> ch13a_functional/src/iterators.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl Counter {
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 38 |     fn new() -> Counter {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Messenger` is never used
[INFO] [stdout]  --> ch15_smartpointers/src/refcell.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Messenger {
[INFO] [stdout]   |           ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LimitTracker` is never constructed
[INFO] [stdout]  --> ch15_smartpointers/src/refcell.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct LimitTracker<'a, T: 'a + Messenger> {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `set_value` are never used
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | / impl<'a, T> LimitTracker<'a, T>
[INFO] [stdout] 12 | | where
[INFO] [stdout] 13 | |     T: Messenger,
[INFO] [stdout]    | |_________________- associated items in this implementation
[INFO] [stdout] 14 |   {
[INFO] [stdout] 15 |       pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |       pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:45:10
[INFO] [stdout]    |
[INFO] [stdout] 45 |     Cons(Rc<RefCell<i32>>, Rc<RcRefCellList>),
[INFO] [stdout]    |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RcRefCellList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 -     Cons(Rc<RefCell<i32>>, Rc<RcRefCellList>),
[INFO] [stdout] 45 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:51:10
[INFO] [stdout]    |
[INFO] [stdout] 51 |     Cons(i32, RefCell<Rc<TailList>>),
[INFO] [stdout]    |     ---- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TailList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 51 -     Cons(i32, RefCell<Rc<TailList>>),
[INFO] [stdout] 51 +     Cons((), RefCell<Rc<TailList>>),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15_smartpointers/src/refcount.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Cons(i32, Rc<RcList>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `RcList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 5 -     Cons(i32, Rc<RcList>),
[INFO] [stdout] 5 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]  --> ch15_smartpointers/src/weakrc.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch15_smartpointers/src/refcell.rs:15:27
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]    |                           ^^                 ^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                           |
[INFO] [stdout]    |                           the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rand v0.4.3
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking ch14b_add_one v0.1.0 (/opt/rustwide/workdir/ch14b_add_one)
[INFO] [stderr]     Checking ch02_guessing_game v0.1.0 (/opt/rustwide/workdir/ch02_guessing_game)
[INFO] [stderr]     Checking ch14a_adder v0.1.0 (/opt/rustwide/workdir/ch14a_adder)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `Command { std: "docker" "inspect" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28", kill_on_drop: false }`
[INFO] [stdout] b6a74967aa2d3dbf7c25b075ab52361caaa9ed8425033e7c21da3135b91a2c28
