[INFO] cloning repository https://github.com/niyiwei/rust-demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/niyiwei/rust-demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniyiwei%2Frust-demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniyiwei%2Frust-demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f805b0058cb680d94658411c1ab3250be1a8e1f
[INFO] checking niyiwei/rust-demo against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniyiwei%2Frust-demo" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/niyiwei/rust-demo on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/niyiwei/rust-demo
[INFO] finished tweaking git repo https://github.com/niyiwei/rust-demo
[INFO] tweaked toml for git repo https://github.com/niyiwei/rust-demo written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/niyiwei/rust-demo already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dbc06077220530385a8d653bf4186a3800078e62b3db0087c1b06e4af5aa9717
[INFO] running `Command { std: "docker" "start" "-a" "dbc06077220530385a8d653bf4186a3800078e62b3db0087c1b06e4af5aa9717", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dbc06077220530385a8d653bf4186a3800078e62b3db0087c1b06e4af5aa9717", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbc06077220530385a8d653bf4186a3800078e62b3db0087c1b06e4af5aa9717", kill_on_drop: false }`
[INFO] [stdout] dbc06077220530385a8d653bf4186a3800078e62b3db0087c1b06e4af5aa9717
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25193d0ba1198d539568c289839a38ee5abc88a8db49a6f6c8eaf522066e2685
[INFO] running `Command { std: "docker" "start" "-a" "25193d0ba1198d539568c289839a38ee5abc88a8db49a6f6c8eaf522066e2685", kill_on_drop: false }`
[INFO] [stderr]     Checking chapter16 v0.1.0 (/opt/rustwide/workdir/chapter16)
[INFO] [stderr]     Checking chapter18 v0.1.0 (/opt/rustwide/workdir/chapter18)
[INFO] [stderr]     Checking hello-demo v0.1.0 (/opt/rustwide/workdir/chapter10)
[INFO] [stderr]     Checking addr v0.1.0 (/opt/rustwide/workdir/addr)
[INFO] [stderr]     Checking chapter20 v0.1.0 (/opt/rustwide/workdir/chapter20)
[INFO] [stderr]     Checking chapter17 v0.1.0 (/opt/rustwide/workdir/chapter17)
[INFO] [stderr]     Checking chapter15 v0.1.0 (/opt/rustwide/workdir/chapter15)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> chapter16/src/lib.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         use std::rc::Rc;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_coordinates`
[INFO] [stdout]   --> chapter18/src/main.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |         fn print_coordinates(&(x, y): &(i32, i32)) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::hash_map::Entry::Vacant`
[INFO] [stdout]  --> chapter10/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::hash_map::Entry::Vacant;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::hash_map::Entry::Vacant`
[INFO] [stdout]  --> chapter10/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::hash_map::Entry::Vacant;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> chapter10/src/main.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         _ => Some(-1),
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_number`
[INFO] [stdout]   --> chapter10/src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let some_number = Some(5);
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_string`
[INFO] [stdout]   --> chapter10/src/main.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let some_string = Some("a string");
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none_value`
[INFO] [stdout]   --> chapter10/src/main.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |     let none_value: Option<i32> = None;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_none_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> chapter10/src/main.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         _ => Some(-1),
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_number`
[INFO] [stdout]   --> chapter10/src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let some_number = Some(5);
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_string`
[INFO] [stdout]   --> chapter10/src/main.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let some_string = Some("a string");
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none_value`
[INFO] [stdout]   --> chapter10/src/main.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |     let none_value: Option<i32> = None;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_none_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> chapter10/src/main.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dine`
[INFO] [stdout]   --> chapter10/src/main.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     Dine,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quarter`
[INFO] [stdout]   --> chapter10/src/main.rs:81:5
[INFO] [stdout]    |
[INFO] [stdout] 81 |     Quarter,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_4`
[INFO] [stdout]   --> chapter10/src/main.rs:94:4
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn chapter6_1_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> chapter10/src/main.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> chapter10/src/main.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     Write(String),
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]    --> chapter10/src/main.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]    --> chapter10/src/main.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn call(&self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_3`
[INFO] [stdout]    --> chapter10/src/main.rs:113:4
[INFO] [stdout]     |
[INFO] [stdout] 113 | fn chapter6_1_3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_2`
[INFO] [stdout]    --> chapter10/src/main.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn chapter6_1_2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_1`
[INFO] [stdout]    --> chapter10/src/main.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn chapter6_1_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]    --> chapter10/src/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     V4(u8, u8, u8, u8),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]    --> chapter10/src/main.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 |     V6(String),
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]    --> chapter10/src/main.rs:148:5
[INFO] [stdout]     |
[INFO] [stdout] 148 |     V4(String),
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]    --> chapter10/src/main.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 149 |     V6(String),
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]    --> chapter10/src/main.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     V4,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]    --> chapter10/src/main.rs:155:5
[INFO] [stdout]     |
[INFO] [stdout] 155 |     V6,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_2_2`
[INFO] [stdout]    --> chapter10/src/main.rs:164:4
[INFO] [stdout]     |
[INFO] [stdout] 164 | fn chapter5_2_2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_2_3`
[INFO] [stdout]    --> chapter10/src/main.rs:179:4
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn chapter5_2_3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]    --> chapter10/src/main.rs:196:8
[INFO] [stdout]     |
[INFO] [stdout] 196 |     fn area(&self) -> i32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> chapter10/src/main.rs:200:8
[INFO] [stdout]     |
[INFO] [stdout] 200 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> chapter10/src/main.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn new(width: i32, height: i32) -> Rectangle {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_2_1`
[INFO] [stdout]    --> chapter10/src/main.rs:214:4
[INFO] [stdout]     |
[INFO] [stdout] 214 | fn chapter5_2_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_1_2`
[INFO] [stdout]    --> chapter10/src/main.rs:224:4
[INFO] [stdout]     |
[INFO] [stdout] 224 | fn chapter5_1_2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_1_1`
[INFO] [stdout]    --> chapter10/src/main.rs:233:4
[INFO] [stdout]     |
[INFO] [stdout] 233 | fn chapter5_1_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> chapter10/src/main.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn area(rectangle: &Rectangle) -> i32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> chapter18/src/main.rs:149:17
[INFO] [stdout]     |
[INFO] [stdout] 149 |                 Quit,
[INFO] [stdout]     |                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> chapter18/src/main.rs:150:17
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 Move { x: i32, y: i32 },
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> chapter18/src/main.rs:151:17
[INFO] [stdout]     |
[INFO] [stdout] 151 |                 Write(String),
[INFO] [stdout]     |                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> chapter10/src/main.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dine`
[INFO] [stdout]   --> chapter10/src/main.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     Dine,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quarter`
[INFO] [stdout]   --> chapter10/src/main.rs:81:5
[INFO] [stdout]    |
[INFO] [stdout] 81 |     Quarter,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_4`
[INFO] [stdout]   --> chapter10/src/main.rs:94:4
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn chapter6_1_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> chapter10/src/main.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> chapter10/src/main.rs:102:5
[INFO] [stdout]     |
[INFO] [stdout] 102 |     Write(String),
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]    --> chapter10/src/main.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]    --> chapter10/src/main.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn call(&self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_3`
[INFO] [stdout]    --> chapter10/src/main.rs:113:4
[INFO] [stdout]     |
[INFO] [stdout] 113 | fn chapter6_1_3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_2`
[INFO] [stdout]    --> chapter10/src/main.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn chapter6_1_2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter6_1_1`
[INFO] [stdout]    --> chapter10/src/main.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn chapter6_1_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]    --> chapter10/src/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     V4(u8, u8, u8, u8),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]    --> chapter10/src/main.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 |     V6(String),
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]    --> chapter10/src/main.rs:148:5
[INFO] [stdout]     |
[INFO] [stdout] 148 |     V4(String),
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]    --> chapter10/src/main.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 149 |     V6(String),
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]    --> chapter10/src/main.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     V4,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]    --> chapter10/src/main.rs:155:5
[INFO] [stdout]     |
[INFO] [stdout] 155 |     V6,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_2_2`
[INFO] [stdout]    --> chapter10/src/main.rs:164:4
[INFO] [stdout]     |
[INFO] [stdout] 164 | fn chapter5_2_2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_2_3`
[INFO] [stdout]    --> chapter10/src/main.rs:179:4
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn chapter5_2_3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]    --> chapter10/src/main.rs:196:8
[INFO] [stdout]     |
[INFO] [stdout] 196 |     fn area(&self) -> i32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> chapter10/src/main.rs:200:8
[INFO] [stdout]     |
[INFO] [stdout] 200 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> chapter10/src/main.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn new(width: i32, height: i32) -> Rectangle {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_2_1`
[INFO] [stdout]    --> chapter10/src/main.rs:214:4
[INFO] [stdout]     |
[INFO] [stdout] 214 | fn chapter5_2_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_1_2`
[INFO] [stdout]    --> chapter10/src/main.rs:224:4
[INFO] [stdout]     |
[INFO] [stdout] 224 | fn chapter5_1_2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chapter5_1_1`
[INFO] [stdout]    --> chapter10/src/main.rs:233:4
[INFO] [stdout]     |
[INFO] [stdout] 233 | fn chapter5_1_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> chapter10/src/main.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn area(rectangle: &Rectangle) -> i32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "25193d0ba1198d539568c289839a38ee5abc88a8db49a6f6c8eaf522066e2685", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25193d0ba1198d539568c289839a38ee5abc88a8db49a6f6c8eaf522066e2685", kill_on_drop: false }`
[INFO] [stdout] 25193d0ba1198d539568c289839a38ee5abc88a8db49a6f6c8eaf522066e2685