[INFO] cloning repository https://github.com/ryohei-emori/rust-learning-codebase
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ryohei-emori/rust-learning-codebase" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryohei-emori%2Frust-learning-codebase", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryohei-emori%2Frust-learning-codebase'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c3c874e0d613ff6a94868cd763a31d729dbf9b3a
[INFO] checking ryohei-emori/rust-learning-codebase against try#54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47 for pr-153041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryohei-emori%2Frust-learning-codebase" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ryohei-emori/rust-learning-codebase
[INFO] removed 0 missing examples
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[INFO] validating manifest of git repo https://github.com/ryohei-emori/rust-learning-codebase on toolchain 54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ryohei-emori/rust-learning-codebase 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" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking ryohei-emori/rust-learning-codebase against try#54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47 for pr-153041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryohei-emori%2Frust-learning-codebase" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ryohei-emori/rust-learning-codebase
[INFO] removed 0 missing examples
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[INFO] tweaked toml for git repo https://github.com/ryohei-emori/rust-learning-codebase written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ryohei-emori/rust-learning-codebase on toolchain 54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ryohei-emori/rust-learning-codebase 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" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 82541a726e32fa0279e2313482ba0b52ab3ada3c4de65b239ec719baa57c9b2a
[INFO] running `Command { std: "docker" "start" "-a" "82541a726e32fa0279e2313482ba0b52ab3ada3c4de65b239ec719baa57c9b2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "82541a726e32fa0279e2313482ba0b52ab3ada3c4de65b239ec719baa57c9b2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82541a726e32fa0279e2313482ba0b52ab3ada3c4de65b239ec719baa57c9b2a", kill_on_drop: false }`
[INFO] [stdout] 82541a726e32fa0279e2313482ba0b52ab3ada3c4de65b239ec719baa57c9b2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54bb9bb1bbe87f59b5a2e9afea4c8cedcf5e0b47" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 60374a73f7a37c4b95335df1563d927e6f3e46c2f26e4036499498ee3e7c9ba6
[INFO] running `Command { std: "docker" "start" "-a" "60374a73f7a37c4b95335df1563d927e6f3e46c2f26e4036499498ee3e7c9ba6", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-learning-codebase v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused macro definition: `say_hello`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:515:14
[INFO] [stdout]     |
[INFO] [stdout] 515 | macro_rules! say_hello {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `create_function`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:522:14
[INFO] [stdout]     |
[INFO] [stdout] 522 | macro_rules! create_function {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `calculate`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:531:14
[INFO] [stdout]     |
[INFO] [stdout] 531 | macro_rules! calculate {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `hashmap`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:538:14
[INFO] [stdout]     |
[INFO] [stdout] 538 | macro_rules! hashmap {
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `print_all`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:551:14
[INFO] [stdout]     |
[INFO] [stdout] 551 | macro_rules! print_all {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `say_hello`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:515:14
[INFO] [stdout]     |
[INFO] [stdout] 515 | macro_rules! say_hello {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `create_function`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:522:14
[INFO] [stdout]     |
[INFO] [stdout] 522 | macro_rules! create_function {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `calculate`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:531:14
[INFO] [stdout]     |
[INFO] [stdout] 531 | macro_rules! calculate {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `hashmap`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:538:14
[INFO] [stdout]     |
[INFO] [stdout] 538 | macro_rules! hashmap {
[INFO] [stdout]     |              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `print_all`
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:551:14
[INFO] [stdout]     |
[INFO] [stdout] 551 | macro_rules! print_all {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_first_word` is never used
[INFO] [stdout]    --> src/chapters/chapter04_lifetimes.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | impl Sentence {
[INFO] [stdout]     | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 236 |     fn get_first_word(&self) -> &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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/chapters/chapter04_lifetimes.rs:353:8
[INFO] [stdout]     |
[INFO] [stdout] 347 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     | ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 353 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> src/chapters/chapter04_lifetimes.rs:369:5
[INFO] [stdout]     |
[INFO] [stdout] 367 | struct Chapter<'a, 'b> {
[INFO] [stdout]     |        ------- field in this struct
[INFO] [stdout] 368 |     title: &'a str,
[INFO] [stdout] 369 |     content: &'a str,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]    --> src/chapters/chapter05_structs_enums.rs:269:8
[INFO] [stdout]     |
[INFO] [stdout] 269 |     V4(u8, u8, u8, u8),
[INFO] [stdout]     |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `IpAddr` 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] 269 -     V4(u8, u8, u8, u8),
[INFO] [stdout] 269 +     V4((), (), (), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/chapters/chapter05_structs_enums.rs:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     V6(String),
[INFO] [stdout]     |     -- ^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `IpAddr` 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] 270 -     V6(String),
[INFO] [stdout] 270 +     V6(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> src/chapters/chapter06_traits.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout]  97 | struct Tweet {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 100 |     reply: bool,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 101 |     retweet: bool,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> src/chapters/chapter06_traits.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 111 | struct NewsArticle {
[INFO] [stdout]     |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 115 |     content: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Iterator2` is never used
[INFO] [stdout]    --> src/chapters/chapter06_traits.rs:604:7
[INFO] [stdout]     |
[INFO] [stdout] 604 | trait Iterator2 {
[INFO] [stdout]     |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_file_super_concise` is never used
[INFO] [stdout]    --> src/chapters/chapter07_error_handling.rs:274:4
[INFO] [stdout]     |
[INFO] [stdout] 274 | fn read_file_super_concise(filename: &str) -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `value` are never read
[INFO] [stdout]    --> src/chapters/chapter07_error_handling.rs:280:5
[INFO] [stdout]     |
[INFO] [stdout] 279 | struct Config {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 280 |     name: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 281 |     value: i32,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Config` 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 `name`, `age`, and `email` are never read
[INFO] [stdout]    --> src/chapters/chapter07_error_handling.rs:541:5
[INFO] [stdout]     |
[INFO] [stdout] 540 | struct User {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 541 |     name: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 542 |     age: u32,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 543 |     email: String,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `User` 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 `x` and `y` are never read
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 135 | struct MixedPoint<T, U> {
[INFO] [stdout]     |        ---------- fields in this struct
[INFO] [stdout] 136 |     x: T,
[INFO] [stdout]     |     ^
[INFO] [stdout] 137 |     y: U,
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MixedPoint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_meters` is never used
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:780:8
[INFO] [stdout]     |
[INFO] [stdout] 779 | impl Distance<Feet> {
[INFO] [stdout]     | ------------------- method in this implementation
[INFO] [stdout] 780 |     fn to_meters(self) -> Distance<Meters> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `disconnect` is never used
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:809:8
[INFO] [stdout]     |
[INFO] [stdout] 804 | impl Connection<Connected> {
[INFO] [stdout]     | -------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 809 |     fn disconnect(self) -> Connection<Disconnected> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `host`, `port`, and `timeout` are never read
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:823:5
[INFO] [stdout]     |
[INFO] [stdout] 822 | struct Config {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 823 |     host: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 824 |     port: u16,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 825 |     timeout: u32,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Config` 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 `0` and `1` are never read
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:278:10
[INFO] [stdout]     |
[INFO] [stdout] 278 |     Cons(i32, Box<List>),
[INFO] [stdout]     |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` 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] 278 -     Cons(i32, Box<List>),
[INFO] [stdout] 278 +     Cons((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:286:5
[INFO] [stdout]     |
[INFO] [stdout] 285 | struct Node {
[INFO] [stdout]     |        ---- field in this struct
[INFO] [stdout] 286 |     value: i32,
[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: fields `host`, `port`, `max_connections`, and `timeout` are never read
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:632:5
[INFO] [stdout]     |
[INFO] [stdout] 631 | struct Server {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 632 |     host: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 633 |     port: u16,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 634 |     max_connections: u32,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 635 |     timeout: Duration,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Server` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_first_word` is never used
[INFO] [stdout]    --> src/chapters/chapter04_lifetimes.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | impl Sentence {
[INFO] [stdout]     | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 236 |     fn get_first_word(&self) -> &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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/chapters/chapter04_lifetimes.rs:353:8
[INFO] [stdout]     |
[INFO] [stdout] 347 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     | ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 353 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> src/chapters/chapter04_lifetimes.rs:369:5
[INFO] [stdout]     |
[INFO] [stdout] 367 | struct Chapter<'a, 'b> {
[INFO] [stdout]     |        ------- field in this struct
[INFO] [stdout] 368 |     title: &'a str,
[INFO] [stdout] 369 |     content: &'a str,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]    --> src/chapters/chapter05_structs_enums.rs:269:8
[INFO] [stdout]     |
[INFO] [stdout] 269 |     V4(u8, u8, u8, u8),
[INFO] [stdout]     |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `IpAddr` 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] 269 -     V4(u8, u8, u8, u8),
[INFO] [stdout] 269 +     V4((), (), (), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/chapters/chapter05_structs_enums.rs:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     V6(String),
[INFO] [stdout]     |     -- ^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `IpAddr` 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] 270 -     V6(String),
[INFO] [stdout] 270 +     V6(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> src/chapters/chapter06_traits.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout]  97 | struct Tweet {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 100 |     reply: bool,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 101 |     retweet: bool,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> src/chapters/chapter06_traits.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 111 | struct NewsArticle {
[INFO] [stdout]     |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 115 |     content: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Iterator2` is never used
[INFO] [stdout]    --> src/chapters/chapter06_traits.rs:604:7
[INFO] [stdout]     |
[INFO] [stdout] 604 | trait Iterator2 {
[INFO] [stdout]     |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_file_super_concise` is never used
[INFO] [stdout]    --> src/chapters/chapter07_error_handling.rs:274:4
[INFO] [stdout]     |
[INFO] [stdout] 274 | fn read_file_super_concise(filename: &str) -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `value` are never read
[INFO] [stdout]    --> src/chapters/chapter07_error_handling.rs:280:5
[INFO] [stdout]     |
[INFO] [stdout] 279 | struct Config {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 280 |     name: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 281 |     value: i32,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Config` 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 `name`, `age`, and `email` are never read
[INFO] [stdout]    --> src/chapters/chapter07_error_handling.rs:541:5
[INFO] [stdout]     |
[INFO] [stdout] 540 | struct User {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 541 |     name: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 542 |     age: u32,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 543 |     email: String,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `User` 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 `x` and `y` are never read
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 135 | struct MixedPoint<T, U> {
[INFO] [stdout]     |        ---------- fields in this struct
[INFO] [stdout] 136 |     x: T,
[INFO] [stdout]     |     ^
[INFO] [stdout] 137 |     y: U,
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MixedPoint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_meters` is never used
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:780:8
[INFO] [stdout]     |
[INFO] [stdout] 779 | impl Distance<Feet> {
[INFO] [stdout]     | ------------------- method in this implementation
[INFO] [stdout] 780 |     fn to_meters(self) -> Distance<Meters> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `disconnect` is never used
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:809:8
[INFO] [stdout]     |
[INFO] [stdout] 804 | impl Connection<Connected> {
[INFO] [stdout]     | -------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 809 |     fn disconnect(self) -> Connection<Disconnected> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `host`, `port`, and `timeout` are never read
[INFO] [stdout]    --> src/chapters/chapter09_generics.rs:823:5
[INFO] [stdout]     |
[INFO] [stdout] 822 | struct Config {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 823 |     host: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 824 |     port: u16,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 825 |     timeout: u32,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Config` 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 `0` and `1` are never read
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:278:10
[INFO] [stdout]     |
[INFO] [stdout] 278 |     Cons(i32, Box<List>),
[INFO] [stdout]     |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` 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] 278 -     Cons(i32, Box<List>),
[INFO] [stdout] 278 +     Cons((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:286:5
[INFO] [stdout]     |
[INFO] [stdout] 285 | struct Node {
[INFO] [stdout]     |        ---- field in this struct
[INFO] [stdout] 286 |     value: i32,
[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: fields `host`, `port`, `max_connections`, and `timeout` are never read
[INFO] [stdout]    --> src/chapters/chapter10_advanced.rs:632:5
[INFO] [stdout]     |
[INFO] [stdout] 631 | struct Server {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 632 |     host: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 633 |     port: u16,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 634 |     max_connections: u32,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 635 |     timeout: Duration,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Server` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `Command { std: "docker" "inspect" "60374a73f7a37c4b95335df1563d927e6f3e46c2f26e4036499498ee3e7c9ba6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60374a73f7a37c4b95335df1563d927e6f3e46c2f26e4036499498ee3e7c9ba6", kill_on_drop: false }`
[INFO] [stdout] 60374a73f7a37c4b95335df1563d927e6f3e46c2f26e4036499498ee3e7c9ba6