[INFO] cloning repository https://github.com/shiinazuki/study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shiinazuki/study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshiinazuki%2Fstudy", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshiinazuki%2Fstudy'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 691165d60e4d1ed8cffd7da5600384af829a6aaf
[INFO] checking shiinazuki/study against master#4847d6a9d07d4be9ba3196f6ad444af2d7bdde72 for pr-134272
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshiinazuki%2Fstudy" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shiinazuki/study on toolchain 4847d6a9d07d4be9ba3196f6ad444af2d7bdde72
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4847d6a9d07d4be9ba3196f6ad444af2d7bdde72" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shiinazuki/study
[INFO] finished tweaking git repo https://github.com/shiinazuki/study
[INFO] tweaked toml for git repo https://github.com/shiinazuki/study written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/shiinazuki/study 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" "+4847d6a9d07d4be9ba3196f6ad444af2d7bdde72" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+4847d6a9d07d4be9ba3196f6ad444af2d7bdde72" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] acb634e1b96cc4ca20b5696f09091cb6c86c5ea57b240d39722dd8bf2b725c35
[INFO] running `Command { std: "docker" "start" "-a" "acb634e1b96cc4ca20b5696f09091cb6c86c5ea57b240d39722dd8bf2b725c35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "acb634e1b96cc4ca20b5696f09091cb6c86c5ea57b240d39722dd8bf2b725c35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acb634e1b96cc4ca20b5696f09091cb6c86c5ea57b240d39722dd8bf2b725c35", kill_on_drop: false }`
[INFO] [stdout] acb634e1b96cc4ca20b5696f09091cb6c86c5ea57b240d39722dd8bf2b725c35
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+4847d6a9d07d4be9ba3196f6ad444af2d7bdde72" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a322eec51173620870c41ef07b17b72974a7270c138665b55aade4d4580a870e
[INFO] running `Command { std: "docker" "start" "-a" "a322eec51173620870c41ef07b17b72974a7270c138665b55aade4d4580a870e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking chapt8_collections v0.1.0 (/opt/rustwide/workdir/chapt8_collections)
[INFO] [stderr]     Checking chapt17_rust_object v0.1.0 (/opt/rustwide/workdir/chapt17_rust_object)
[INFO] [stderr]     Checking chapt20_web_server v0.1.0 (/opt/rustwide/workdir/chapt20_web_server)
[INFO] [stderr]     Checking chapt12_io_item v0.1.0 (/opt/rustwide/workdir/chapt12_io_item)
[INFO] [stderr]     Checking chapt11_test v0.1.0 (/opt/rustwide/workdir/chapt11_test)
[INFO] [stderr]     Checking chapt9_error v0.1.0 (/opt/rustwide/workdir/chapt9_error)
[INFO] [stderr]     Checking chapt13_closures_iterators v0.1.0 (/opt/rustwide/workdir/chapt13_closures_iterators)
[INFO] [stderr]     Checking chapt10_trait v0.1.0 (/opt/rustwide/workdir/chapt10_trait)
[INFO] [stderr]     Checking chapt3_variables v0.1.0 (/opt/rustwide/workdir/chapt3_variables)
[INFO] [stderr]     Checking a_standard v0.1.0 (/opt/rustwide/workdir/a_standard)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> chapt17_rust_object/src/lib.rs:100:31
[INFO] [stdout]     |
[INFO] [stdout] 100 |         fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> chapt11_test/src/lib.rs:32:17
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:146:32
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn longest_one<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                                ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> chapt11_test/src/lib.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> chapt11_test/src/lib.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 19 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]   --> chapt11_test/src/lib.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Guess {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Import` is never constructed
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 | struct Import<'a> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> chapt11_test/src/lib.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl Guess {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 41 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `level` and `announce_and_return_part` are never used
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<'a, 'b> Import<'a> {
[INFO] [stdout]     | ----------------------- methods in this implementation
[INFO] [stdout] 108 |     fn level(&self) -> i32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 113 |     fn announce_and_return_part(&'a self, announcement: &'b str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:134:5
[INFO] [stdout]     |
[INFO] [stdout] 133 | struct ImportantExcerpt<'a> {
[INFO] [stdout]     |        ---------------- field in this struct
[INFO] [stdout] 134 |     part: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ImportantExcerpt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_one` is never used
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn longest_one<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> chapt8_collections/src/vect.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut v = vec![1, 2, 3, 4, 5, 6];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `height` is never read
[INFO] [stdout]    --> chapt13_closures_iterators/src/bin/closures.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | struct Rectangle {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] 123 |     width: u32,
[INFO] [stdout] 124 |     height: u32,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     Int(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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] 57 |     Int(()),
[INFO] [stdout]    |         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:58:11
[INFO] [stdout]    |
[INFO] [stdout] 58 |     Float(f64),
[INFO] [stdout]    |     ----- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 58 |     Float(()),
[INFO] [stdout]    |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:59:10
[INFO] [stdout]    |
[INFO] [stdout] 59 |     Text(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 59 |     Text(()),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> chapt10_trait/src/bin/generics.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 79 | struct De<T, U> {
[INFO] [stdout]    |        -- fields in this struct
[INFO] [stdout] 80 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 81 |     y: U,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `De` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `x` and `y` are never used
[INFO] [stdout]    --> chapt10_trait/src/bin/generics.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 99  | impl<T> Point<T> {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] 100 |     fn x(&self) -> &T {
[INFO] [stdout]     |        ^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     fn y(&self) -> &T {
[INFO] [stdout]     |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]    --> chapt10_trait/src/bin/generics.rs:109:8
[INFO] [stdout]     |
[INFO] [stdout] 108 | impl Point<f64> {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] 109 |     fn distance_from_origin(&self) -> f64 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]  --> chapt17_rust_object/src/bin/trait.rs:7:37
[INFO] [stdout]   |
[INFO] [stdout] 7 |                 label: String::from({ "Ok" }),
[INFO] [stdout]   |                                     ^^    ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]   |
[INFO] [stdout] 7 -                 label: String::from({ "Ok" }),
[INFO] [stdout] 7 +                 label: String::from("Ok"),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Screen_Two` should have an upper camel case name
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Screen_Two<T: Draw> {
[INFO] [stdout]    |            ^^^^^^^^^^ help: convert the identifier to upper camel case: `ScreenTwo`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is more private than the item `Screen::components`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub components: Vec<Box<dyn Draw>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ field `Screen::components` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Draw` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:89:1
[INFO] [stdout]    |
[INFO] [stdout] 89 | trait Draw {
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is more private than the item `Screen_Two`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:74:1
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Screen_Two<T: Draw> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ struct `Screen_Two` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Draw` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:89:1
[INFO] [stdout]    |
[INFO] [stdout] 89 | trait Draw {
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is more private than the item `Screen_Two<T>`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:78:1
[INFO] [stdout]    |
[INFO] [stdout] 78 | / impl<T> Screen_Two<T>
[INFO] [stdout] 79 | | where
[INFO] [stdout] 80 | |     T: Draw,
[INFO] [stdout]    | |____________^ implementation `Screen_Two<T>` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Draw` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:89:1
[INFO] [stdout]    |
[INFO] [stdout] 89 | trait Draw {
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapt6_enum_match v0.1.0 (/opt/rustwide/workdir/chapt6_enum_match)
[INFO] [stderr]     Checking chapt16_concurrent_program v0.1.0 (/opt/rustwide/workdir/chapt16_concurrent_program)
[INFO] [stderr]     Checking chapt15_smart_pointer v0.1.0 (/opt/rustwide/workdir/chapt15_smart_pointer)
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]  --> chapt17_rust_object/src/bin/trait.rs:7:37
[INFO] [stdout]   |
[INFO] [stdout] 7 |                 label: String::from({ "Ok" }),
[INFO] [stdout]   |                                     ^^    ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]   |
[INFO] [stdout] 7 -                 label: String::from({ "Ok" }),
[INFO] [stdout] 7 +                 label: String::from("Ok"),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Screen_Two` should have an upper camel case name
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Screen_Two<T: Draw> {
[INFO] [stdout]    |            ^^^^^^^^^^ help: convert the identifier to upper camel case: `ScreenTwo`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny` and `Nickel` are never constructed
[INFO] [stdout]  --> chapt6_enum_match/src/bin/match.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum Coin {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 6 |     Penny,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     Nickel,
[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]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alabama` is never constructed
[INFO] [stdout]   --> chapt6_enum_match/src/bin/match.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum UsState {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] 14 |     Alabama,
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is more private than the item `Screen::components`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub components: Vec<Box<dyn Draw>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ field `Screen::components` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Draw` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:89:1
[INFO] [stdout]    |
[INFO] [stdout] 89 | trait Draw {
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is more private than the item `Screen_Two`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:74:1
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Screen_Two<T: Draw> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ struct `Screen_Two` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Draw` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:89:1
[INFO] [stdout]    |
[INFO] [stdout] 89 | trait Draw {
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is more private than the item `Screen_Two<T>`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:78:1
[INFO] [stdout]    |
[INFO] [stdout] 78 | / impl<T> Screen_Two<T>
[INFO] [stdout] 79 | | where
[INFO] [stdout] 80 | |     T: Draw,
[INFO] [stdout]    | |____________^ implementation `Screen_Two<T>` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Draw` is only usable at visibility `pub(crate)`
[INFO] [stdout]   --> chapt17_rust_object/src/bin/trait.rs:89:1
[INFO] [stdout]    |
[INFO] [stdout] 89 | trait Draw {
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapt4_ownership v0.1.0 (/opt/rustwide/workdir/chapt4_ownership)
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 9  |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 10 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrNew` 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] 17 |     V4(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrNew` 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] 18 |     V6(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     V4(u8, u8, u8, u8),
[INFO] [stdout]    |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrOnther` 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] 23 |     V4((), (), (), ()),
[INFO] [stdout]    |        ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrOnther` 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] 24 |     V6(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:74:11
[INFO] [stdout]    |
[INFO] [stdout] 74 |     Write(String),
[INFO] [stdout]    |     ----- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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] 74 |     Write(()),
[INFO] [stdout]    |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 71 | enum Message {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 72 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 73 |     Move { x: i32, y: i32 },
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 74 |     Write(String),
[INFO] [stdout] 75 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapt1_hello_world v0.1.0 (/opt/rustwide/workdir/chapt1_hello_world)
[INFO] [stderr]     Checking chapt5_struct v0.1.0 (/opt/rustwide/workdir/chapt5_struct)
[INFO] [stdout] warning: type `List_Rc` should have an upper camel case name
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:45:6
[INFO] [stdout]    |
[INFO] [stdout] 45 | enum List_Rc<T> {
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `ListRc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let b = List_Rc::Cons(3, Rc::clone(&a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let c = List_Rc::Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |     Cons(T, Rc<List_Rc<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List_Rc` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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] 46 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/box.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |     Cons(T, Box<List<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field 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]    = note: `#[warn(dead_code)]` on by default
[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] 26 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |     Cons(T, Rc<Box<List<T>>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field 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 field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 52 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny` and `Nickel` are never constructed
[INFO] [stdout]  --> chapt6_enum_match/src/bin/match.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum Coin {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 6 |     Penny,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     Nickel,
[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]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/refcycle.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | struct Node {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 93 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 94 |     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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alabama` is never constructed
[INFO] [stdout]   --> chapt6_enum_match/src/bin/match.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum UsState {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] 14 |     Alabama,
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> chapt10_trait/src/bin/generics.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 79 | struct De<T, U> {
[INFO] [stdout]    |        -- fields in this struct
[INFO] [stdout] 80 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 81 |     y: U,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `De` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `x` and `y` are never used
[INFO] [stdout]    --> chapt10_trait/src/bin/generics.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 99  | impl<T> Point<T> {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] 100 |     fn x(&self) -> &T {
[INFO] [stdout]     |        ^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     fn y(&self) -> &T {
[INFO] [stdout]     |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]    --> chapt10_trait/src/bin/generics.rs:109:8
[INFO] [stdout]     |
[INFO] [stdout] 108 | impl Point<f64> {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] 109 |     fn distance_from_origin(&self) -> f64 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `active`, `username`, and `email` are never read
[INFO] [stdout]    --> chapt5_struct/src/bin/struct.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Person<'a> {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 101 |     active: bool,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 102 |     username: &'a str,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 103 |     email: &'a str,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:100:57
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn _some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]     |                                                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:100:64
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn _some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]     |                                                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:103:31
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn _some_function_siple<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:103:38
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn _some_function_siple<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]     |                                      ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:114:17
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn _notify_more(summary: &(impl Summary + Display)) {}
[INFO] [stdout]     |                 ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:116:45
[INFO] [stdout]     |
[INFO] [stdout] 116 | fn _notify_more_bound<T: Summary + Display>(summary: &T) {}
[INFO] [stdout]     |                                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary1`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:127:19
[INFO] [stdout]     |
[INFO] [stdout] 127 | fn _notify_second(summary1: &impl Summary, summary2: &impl Summary) {}
[INFO] [stdout]     |                   ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary2`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:127:44
[INFO] [stdout]     |
[INFO] [stdout] 127 | fn _notify_second(summary1: &impl Summary, summary2: &impl Summary) {}
[INFO] [stdout]     |                                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary1`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:131:29
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn _notify_same<T: Summary>(summary1: &T, summary2: &T) {}
[INFO] [stdout]     |                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary2`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:131:43
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn _notify_same<T: Summary>(summary1: &T, summary2: &T) {}
[INFO] [stdout]     |                                           ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct Pair<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<T> Pair<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 45 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | impl<T: Display + PartialOrd> Pair<T> {
[INFO] [stdout]    | ------------------------------------- method in this implementation
[INFO] [stdout] 52 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarizable` is never used
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:158:5
[INFO] [stdout]     |
[INFO] [stdout] 154 | struct NewsArticle {
[INFO] [stdout]     |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 158 |     content: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:174:5
[INFO] [stdout]     |
[INFO] [stdout] 171 | struct Tweet {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 174 |     reply: bool,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 175 |     retweet: bool,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> chapt17_rust_object/src/lib.rs:100:31
[INFO] [stdout]     |
[INFO] [stdout] 100 |         fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:146:32
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn longest_one<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                                ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Import` is never constructed
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 | struct Import<'a> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `level` and `announce_and_return_part` are never used
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<'a, 'b> Import<'a> {
[INFO] [stdout]     | ----------------------- methods in this implementation
[INFO] [stdout] 108 |     fn level(&self) -> i32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 113 |     fn announce_and_return_part(&'a self, announcement: &'b str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:134:5
[INFO] [stdout]     |
[INFO] [stdout] 133 | struct ImportantExcerpt<'a> {
[INFO] [stdout]     |        ---------------- field in this struct
[INFO] [stdout] 134 |     part: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ImportantExcerpt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_one` is never used
[INFO] [stdout]    --> chapt10_trait/src/bin/lifetime.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn longest_one<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `List_Rc` should have an upper camel case name
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:45:6
[INFO] [stdout]    |
[INFO] [stdout] 45 | enum List_Rc<T> {
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `ListRc`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let b = List_Rc::Cons(3, Rc::clone(&a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let c = List_Rc::Cons(4, Rc::clone(&a));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |     Cons(T, Rc<List_Rc<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List_Rc` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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] 46 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/rc.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |     Cons(T, Rc<Box<List<T>>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field 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 field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 52 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/refcell.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     Cons(T, Rc<List<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field 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]    = note: `#[warn(dead_code)]` on by default
[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] 69 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username` and `age` are never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/refcell.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 78 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 79 |     age: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]   --> chapt11_test/src/lib.rs:61:36
[INFO] [stdout]    |
[INFO] [stdout] 61 |     use std::{thread, time::{self, Duration}};
[INFO] [stdout]    |                                    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/refcycle.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | struct Node {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 93 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 94 |     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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/refcell.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     Cons(T, Rc<List<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field 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]    = note: `#[warn(dead_code)]` on by default
[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] 69 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username` and `age` are never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/refcell.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 78 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 79 |     age: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> chapt11_test/src/lib.rs:32:17
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> chapt11_test/src/lib.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Guess {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 37 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 9  |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 10 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[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]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrNew` 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] 17 |     V4(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrNew` 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] 18 |     V6(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     V4(u8, u8, u8, u8),
[INFO] [stdout]    |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrOnther` 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] 23 |     V4((), (), (), ()),
[INFO] [stdout]    |        ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrOnther` 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] 24 |     V6(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:74:11
[INFO] [stdout]    |
[INFO] [stdout] 74 |     Write(String),
[INFO] [stdout]    |     ----- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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] 74 |     Write(()),
[INFO] [stdout]    |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]   --> chapt6_enum_match/src/bin/enum.rs:72:5
[INFO] [stdout]    |
[INFO] [stdout] 71 | enum Message {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 72 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 73 |     Move { x: i32, y: i32 },
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 74 |     Write(String),
[INFO] [stdout] 75 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapt14_cargo v0.1.0 (/opt/rustwide/workdir/chapt14_cargo)
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:100:57
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn _some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]     |                                                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:100:64
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn _some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]     |                                                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:103:31
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn _some_function_siple<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:103:38
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn _some_function_siple<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]     |                                      ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:114:17
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn _notify_more(summary: &(impl Summary + Display)) {}
[INFO] [stdout]     |                 ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:116:45
[INFO] [stdout]     |
[INFO] [stdout] 116 | fn _notify_more_bound<T: Summary + Display>(summary: &T) {}
[INFO] [stdout]     |                                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary1`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:127:19
[INFO] [stdout]     |
[INFO] [stdout] 127 | fn _notify_second(summary1: &impl Summary, summary2: &impl Summary) {}
[INFO] [stdout]     |                   ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary2`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:127:44
[INFO] [stdout]     |
[INFO] [stdout] 127 | fn _notify_second(summary1: &impl Summary, summary2: &impl Summary) {}
[INFO] [stdout]     |                                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary1`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:131:29
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn _notify_same<T: Summary>(summary1: &T, summary2: &T) {}
[INFO] [stdout]     |                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `summary2`
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:131:43
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn _notify_same<T: Summary>(summary1: &T, summary2: &T) {}
[INFO] [stdout]     |                                           ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_summary2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `option_get_or_insert_default` has been stable since 1.83.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> a_standard/src/bin/option.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(option_get_or_insert_default)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct Pair<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<T> Pair<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 45 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | impl<T: Display + PartialOrd> Pair<T> {
[INFO] [stdout]    | ------------------------------------- method in this implementation
[INFO] [stdout] 52 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarizable` is never used
[INFO] [stdout]   --> chapt10_trait/src/bin/trait.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:158:5
[INFO] [stdout]     |
[INFO] [stdout] 154 | struct NewsArticle {
[INFO] [stdout]     |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 158 |     content: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> chapt10_trait/src/bin/trait.rs:174:5
[INFO] [stdout]     |
[INFO] [stdout] 171 | struct Tweet {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 174 |     reply: bool,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 175 |     retweet: bool,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> chapt15_smart_pointer/src/bin/box.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |     Cons(T, Box<List<T>>),
[INFO] [stdout]    |     ----    ^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field 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]    = note: `#[warn(dead_code)]` on by default
[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] 26 |     Cons(T, ()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapt18_patterns v0.1.0 (/opt/rustwide/workdir/chapt18_patterns)
[INFO] [stdout] warning: field `height` is never read
[INFO] [stdout]    --> chapt13_closures_iterators/src/bin/closures.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | struct Rectangle {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] 123 |     width: u32,
[INFO] [stdout] 124 |     height: u32,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> chapt8_collections/src/vect.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut v = vec![1, 2, 3, 4, 5, 6];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     Int(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[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] 57 |     Int(()),
[INFO] [stdout]    |         ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:58:11
[INFO] [stdout]    |
[INFO] [stdout] 58 |     Float(f64),
[INFO] [stdout]    |     ----- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 58 |     Float(()),
[INFO] [stdout]    |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapt8_collections/src/vect.rs:59:10
[INFO] [stdout]    |
[INFO] [stdout] 59 |     Text(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SpreadsheetCell` 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] 59 |     Text(()),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `active`, `username`, and `email` are never read
[INFO] [stdout]    --> chapt5_struct/src/bin/struct.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Person<'a> {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 101 |     active: bool,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 102 |     username: &'a str,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 103 |     email: &'a str,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `option_get_or_insert_default` has been stable since 1.83.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> a_standard/src/bin/option.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(option_get_or_insert_default)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: failed to write `/opt/rustwide/target/debug/.fingerprint/chapt5_struct-732b4d7aa6a85495/test-bin-struct`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] rustc-LLVM ERROR: IO failure on output stream: No space left on device
[INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmetaCOn65i"
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `quote` (lib) due to 1 previous error
[INFO] [stderr] error: could not compile `proc-macro2` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to parse process output: `/opt/rustwide/rustup-home/toolchains/4847d6a9d07d4be9ba3196f6ad444af2d7bdde72/bin/rustc --crate-name proc_macro2 --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.86/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no --cfg 'feature="proc-macro"' --check-cfg 'cfg(docsrs)' --check-cfg 'cfg(feature, values("default", "nightly", "proc-macro", "span-locations"))' -C metadata=6ebef8d4d6d4ba9c -C extra-filename=-7dfd055de710dc86 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-b240505bfd42d77c.rmeta --cap-lints allow --cap-lints=forbid --cfg wrap_proc_macro --cfg proc_macro_span --check-cfg 'cfg(fuzzing)' --check-cfg 'cfg(no_is_available)' --check-cfg 'cfg(no_literal_byte_character)' --check-cfg 'cfg(no_literal_c_string)' --check-cfg 'cfg(no_source_text)' --check-cfg 'cfg(proc_macro_span)' --check-cfg 'cfg(procmacro2_backtrace)' --check-cfg 'cfg(procmacro2_nightly_testing)' --check-cfg 'cfg(procmacro2_semver_exempt)' --check-cfg 'cfg(randomize_layout)' --check-cfg 'cfg(span_locations)' --check-cfg 'cfg(super_unstable)' --check-cfg 'cfg(wrap_proc_macro)'` (exit status: 101)
[INFO] [stdout] error: failed to write to `/opt/rustwide/target/debug/deps/rmetaLQl95h/lib.rmeta`: No space left on device (os error 28)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmetaO3weNO"
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] error: could not compile `a_standard` (bin "option" test) due to 1 previous error; 1 warning emitted
[INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmetalBM63h"
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmeta3waQ6B"
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't create a temp dir: No space left on device (os error 28) at path "/opt/rustwide/target/debug/deps/rmetacrVBnX"
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `a_standard` (bin "res" test) due to 1 previous error
[INFO] [stderr] error: could not compile `libc` (lib) due to 1 previous error
[INFO] [stderr] error: could not compile `a_standard` (bin "vect" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "a322eec51173620870c41ef07b17b72974a7270c138665b55aade4d4580a870e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a322eec51173620870c41ef07b17b72974a7270c138665b55aade4d4580a870e", kill_on_drop: false }`
[INFO] [stdout] a322eec51173620870c41ef07b17b72974a7270c138665b55aade4d4580a870e