[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] 8207af1d280c9866f5364130b068f10ae13e52bb
[INFO] checking niyiwei/rust-demo against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniyiwei%2Frust-demo" "/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/niyiwei/rust-demo on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "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-7-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 38f6b2b27bb435f41797f9fc51a00124c2edf1da6aa9487bc9d0f1d8b1a8d5d9
[INFO] running `Command { std: "docker" "start" "-a" "38f6b2b27bb435f41797f9fc51a00124c2edf1da6aa9487bc9d0f1d8b1a8d5d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "38f6b2b27bb435f41797f9fc51a00124c2edf1da6aa9487bc9d0f1d8b1a8d5d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38f6b2b27bb435f41797f9fc51a00124c2edf1da6aa9487bc9d0f1d8b1a8d5d9", kill_on_drop: false }`
[INFO] [stdout] 38f6b2b27bb435f41797f9fc51a00124c2edf1da6aa9487bc9d0f1d8b1a8d5d9
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd31cb589ce1f987f5db123673837766d3898350bb3f6689bb8ed5cb3e7a5899
[INFO] running `Command { std: "docker" "start" "-a" "cd31cb589ce1f987f5db123673837766d3898350bb3f6689bb8ed5cb3e7a5899", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Checking chapter16 v0.1.0 (/opt/rustwide/workdir/chapter16)
[INFO] [stderr]     Checking chapter-1 v0.1.0 (/opt/rustwide/workdir/chapter-1)
[INFO] [stderr]     Checking hello-demo v0.1.0 (/opt/rustwide/workdir/chapter10)
[INFO] [stderr]     Checking chapter17 v0.1.0 (/opt/rustwide/workdir/chapter17)
[INFO] [stderr]     Checking chapter15 v0.1.0 (/opt/rustwide/workdir/chapter15)
[INFO] [stderr]     Checking addr v0.1.0 (/opt/rustwide/workdir/addr)
[INFO] [stderr]     Checking chapter18 v0.1.0 (/opt/rustwide/workdir/chapter18)
[INFO] [stderr]     Checking chapter20 v0.1.0 (/opt/rustwide/workdir/chapter20)
[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: 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 `print_coordinates` is never used
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> chapter-1/src/main.rs:16:16
[INFO] [stdout]    |
[INFO] [stdout] 16 |     struct Abc(i32);
[INFO] [stdout]    |            --- ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Abc` 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 `name` and `age` are never read
[INFO] [stdout]   --> chapter-1/src/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     struct Person<'a> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 27 |         name: &'a str,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 28 |         age: u8,
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings 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]    |         ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> chapter10/src/main.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |         Some(i) => Some(i + 1),
[INFO] [stdout]    |         ------- matches some of the same values
[INFO] [stdout] 54 |         None => None,
[INFO] [stdout]    |         ---- matches some of the same values
[INFO] [stdout] 55 |         // default handler 机制.
[INFO] [stdout] 56 |         _ => Some(-1),
[INFO] [stdout]    |         ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[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]    |         ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> chapter10/src/main.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |         Some(i) => Some(i + 1),
[INFO] [stdout]    |         ------- matches some of the same values
[INFO] [stdout] 54 |         None => None,
[INFO] [stdout]    |         ---- matches some of the same values
[INFO] [stdout] 55 |         // default handler 机制.
[INFO] [stdout] 56 |         _ => Some(-1),
[INFO] [stdout]    |         ^ collectively making this unreachable
[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_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: `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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> chapter15/src/lib.rs:21:18
[INFO] [stdout]    |
[INFO] [stdout] 21 |             Cons(i32, Box<List>),
[INFO] [stdout]    |             ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 21 |             Cons((), ()),
[INFO] [stdout]    |                  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Dine`, and `Quarter` are never constructed
[INFO] [stdout]   --> chapter10/src/main.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | enum Coin {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 78 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 79 |     Nickel,
[INFO] [stdout] 80 |     Dine,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 81 |     Quarter,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter6_1_4` is never used
[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: enum `Message` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:100:6
[INFO] [stdout]     |
[INFO] [stdout] 100 | enum Message {
[INFO] [stdout]     |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl Message {
[INFO] [stdout]     | ------------ method in this implementation
[INFO] [stdout] 108 |     fn call(&self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter6_1_3` is never used
[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 `chapter6_1_2` is never used
[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 `chapter6_1_1` is never used
[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: enum `IpAddrKind3` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:141:6
[INFO] [stdout]     |
[INFO] [stdout] 141 | enum IpAddrKind3 {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind2` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:147:6
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum IpAddrKind2 {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind1` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum IpAddrKind1 {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]    --> chapter10/src/main.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | struct IpAddr {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Dine`, and `Quarter` are never constructed
[INFO] [stdout]   --> chapter10/src/main.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | enum Coin {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 78 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 79 |     Nickel,
[INFO] [stdout] 80 |     Dine,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 81 |     Quarter,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter5_2_2` is never used
[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 `chapter5_2_3` is never used
[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: function `chapter6_1_4` is never used
[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: struct `Rectangle` is never constructed
[INFO] [stdout]    --> chapter10/src/main.rs:189:8
[INFO] [stdout]     |
[INFO] [stdout] 189 | struct Rectangle {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `new` are never used
[INFO] [stdout]    --> chapter10/src/main.rs:196:8
[INFO] [stdout]     |
[INFO] [stdout] 194 | impl Rectangle {
[INFO] [stdout]     | -------------- associated items in this implementation
[INFO] [stdout] 195 |     // 增加结构体的方法
[INFO] [stdout] 196 |     fn area(&self) -> i32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 200 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 205 |     fn new(width: i32, height: i32) -> Rectangle {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter5_2_1` is never used
[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: enum `Message` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:100:6
[INFO] [stdout]     |
[INFO] [stdout] 100 | enum Message {
[INFO] [stdout]     |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter5_1_2` is never used
[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: method `call` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl Message {
[INFO] [stdout]     | ------------ method in this implementation
[INFO] [stdout] 108 |     fn call(&self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter5_1_1` is never used
[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 `chapter6_1_3` is never used
[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 `area` is never used
[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: function `chapter6_1_2` is never used
[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 `chapter6_1_1` is never used
[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: enum `IpAddrKind3` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:141:6
[INFO] [stdout]     |
[INFO] [stdout] 141 | enum IpAddrKind3 {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind2` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:147:6
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum IpAddrKind2 {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind1` is never used
[INFO] [stdout]    --> chapter10/src/main.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum IpAddrKind1 {
[INFO] [stdout]     |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]    --> chapter10/src/main.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | struct IpAddr {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter5_2_2` is never used
[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 `chapter5_2_3` is never used
[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: struct `Rectangle` is never constructed
[INFO] [stdout]    --> chapter10/src/main.rs:189:8
[INFO] [stdout]     |
[INFO] [stdout] 189 | struct Rectangle {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `new` are never used
[INFO] [stdout]    --> chapter10/src/main.rs:196:8
[INFO] [stdout]     |
[INFO] [stdout] 194 | impl Rectangle {
[INFO] [stdout]     | -------------- associated items in this implementation
[INFO] [stdout] 195 |     // 增加结构体的方法
[INFO] [stdout] 196 |     fn area(&self) -> i32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 200 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 205 |     fn new(width: i32, height: i32) -> Rectangle {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `chapter5_2_1` is never used
[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 `chapter5_1_2` is never used
[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 `chapter5_1_1` is never used
[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 `area` is never used
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> chapter18/src/main.rs:149:17
[INFO] [stdout]     |
[INFO] [stdout] 148 |             enum Message {
[INFO] [stdout]     |                  ------- variants in this enum
[INFO] [stdout] 149 |                 Quit,
[INFO] [stdout]     |                 ^^^^
[INFO] [stdout] 150 |                 Move { x: i32, y: i32 },
[INFO] [stdout]     |                 ^^^^
[INFO] [stdout] 151 |                 Write(String),
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "cd31cb589ce1f987f5db123673837766d3898350bb3f6689bb8ed5cb3e7a5899", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd31cb589ce1f987f5db123673837766d3898350bb3f6689bb8ed5cb3e7a5899", kill_on_drop: false }`
[INFO] [stdout] cd31cb589ce1f987f5db123673837766d3898350bb3f6689bb8ed5cb3e7a5899