[INFO] cloning repository https://github.com/cangSDARM/rust-scratch
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cangSDARM/rust-scratch" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcangSDARM%2Frust-scratch", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcangSDARM%2Frust-scratch'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1603ff5fc4301c2c4d0188a89f2f60688d51c722
[INFO] testing cangSDARM/rust-scratch against master#414482f6a0d4e7290f614300581a0b55442552a3 for pr-140985
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcangSDARM%2Frust-scratch" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cangSDARM/rust-scratch on toolchain 414482f6a0d4e7290f614300581a0b55442552a3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+414482f6a0d4e7290f614300581a0b55442552a3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cangSDARM/rust-scratch
[INFO] finished tweaking git repo https://github.com/cangSDARM/rust-scratch
[INFO] tweaked toml for git repo https://github.com/cangSDARM/rust-scratch written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/cangSDARM/rust-scratch 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" "+414482f6a0d4e7290f614300581a0b55442552a3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+414482f6a0d4e7290f614300581a0b55442552a3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c37884c0aeee38c1f6ff3a4b984cf6d89925c981101541934a853dacd369a9be
[INFO] running `Command { std: "docker" "start" "-a" "c37884c0aeee38c1f6ff3a4b984cf6d89925c981101541934a853dacd369a9be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c37884c0aeee38c1f6ff3a4b984cf6d89925c981101541934a853dacd369a9be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c37884c0aeee38c1f6ff3a4b984cf6d89925c981101541934a853dacd369a9be", kill_on_drop: false }`
[INFO] [stdout] c37884c0aeee38c1f6ff3a4b984cf6d89925c981101541934a853dacd369a9be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+414482f6a0d4e7290f614300581a0b55442552a3" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e784cedd8987c310d58012622fb8684eefa7e8720a9431635669778b2d515295
[INFO] running `Command { std: "docker" "start" "-a" "e784cedd8987c310d58012622fb8684eefa7e8720a9431635669778b2d515295", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]    Compiling c2-chacha v0.2.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling rust-scratch v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition value: `derive`
[INFO] [stdout]    --> src/traits.rs:125:7
[INFO] [stdout]     |
[INFO] [stdout] 125 | #[cfg(feature = "derive")]
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `derive` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_coordinates` is never used
[INFO] [stdout]   --> src/main.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | 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: trait `Add` is never used
[INFO] [stdout]   --> src/generics.rs:67:7
[INFO] [stdout]    |
[INFO] [stdout] 67 | trait Add<RHS = Self> {
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/generics.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 | struct Millimeters(u32);
[INFO] [stdout]    |        ----------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Meters` is never constructed
[INFO] [stdout]   --> src/generics.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Meters(u32);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize` and `summary` are never used
[INFO] [stdout]   --> src/traits.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub trait Summary {
[INFO] [stdout]    |           ------- methods in this trait
[INFO] [stdout] 9  |   /// 方法签名, 必须实现的方法
[INFO] [stdout] 10 |   fn summarize(&self) -> String;
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |   fn summary(&self) -> String {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `News` is never constructed
[INFO] [stdout]   --> src/traits.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct News {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tweet` is never constructed
[INFO] [stdout]   --> src/traits.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct Tweet {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]   --> src/traits.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct Wrapper(Vec<String>);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/traits.rs:133:7
[INFO] [stdout]     |
[INFO] [stdout] 133 | trait OutlinePrint: Display {
[INFO] [stdout]     |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]    --> src/traits.rs:146:6
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub trait AssociatedTypes {
[INFO] [stdout]     |           --------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 146 |   fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/lifecricle.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 |     format!("{}", another);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `Command { std: "docker" "inspect" "e784cedd8987c310d58012622fb8684eefa7e8720a9431635669778b2d515295", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e784cedd8987c310d58012622fb8684eefa7e8720a9431635669778b2d515295", kill_on_drop: false }`
[INFO] [stdout] e784cedd8987c310d58012622fb8684eefa7e8720a9431635669778b2d515295
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+414482f6a0d4e7290f614300581a0b55442552a3" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 093374dc7bb2d878933ef6a7a455a95c1c70d7a2b48455a1b0366cacb8db2699
[INFO] running `Command { std: "docker" "start" "-a" "093374dc7bb2d878933ef6a7a455a95c1c70d7a2b48455a1b0366cacb8db2699", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-scratch v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition value: `derive`
[INFO] [stdout]    --> src/traits.rs:125:7
[INFO] [stdout]     |
[INFO] [stdout] 125 | #[cfg(feature = "derive")]
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]     |
[INFO] [stdout]     = note: no expected values for `feature`
[INFO] [stdout]     = help: consider adding `derive` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_coordinates` is never used
[INFO] [stdout]   --> src/main.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | 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: trait `Add` is never used
[INFO] [stdout]   --> src/generics.rs:67:7
[INFO] [stdout]    |
[INFO] [stdout] 67 | trait Add<RHS = Self> {
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/generics.rs:72:20
[INFO] [stdout]    |
[INFO] [stdout] 72 | struct Millimeters(u32);
[INFO] [stdout]    |        ----------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Meters` is never constructed
[INFO] [stdout]   --> src/generics.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Meters(u32);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize` and `summary` are never used
[INFO] [stdout]   --> src/traits.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub trait Summary {
[INFO] [stdout]    |           ------- methods in this trait
[INFO] [stdout] 9  |   /// 方法签名, 必须实现的方法
[INFO] [stdout] 10 |   fn summarize(&self) -> String;
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |   fn summary(&self) -> String {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `News` is never constructed
[INFO] [stdout]   --> src/traits.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct News {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tweet` is never constructed
[INFO] [stdout]   --> src/traits.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct Tweet {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]   --> src/traits.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct Wrapper(Vec<String>);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/traits.rs:133:7
[INFO] [stdout]     |
[INFO] [stdout] 133 | trait OutlinePrint: Display {
[INFO] [stdout]     |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]    --> src/traits.rs:146:6
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub trait AssociatedTypes {
[INFO] [stdout]     |           --------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 146 |   fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/lifecricle.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 |     format!("{}", another);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "093374dc7bb2d878933ef6a7a455a95c1c70d7a2b48455a1b0366cacb8db2699", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "093374dc7bb2d878933ef6a7a455a95c1c70d7a2b48455a1b0366cacb8db2699", kill_on_drop: false }`
[INFO] [stdout] 093374dc7bb2d878933ef6a7a455a95c1c70d7a2b48455a1b0366cacb8db2699
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+414482f6a0d4e7290f614300581a0b55442552a3" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] dad2c4ce757e656de7d5a0ee6725e78eff7079cb46643f3dae3a1122d46d9335
[INFO] running `Command { std: "docker" "start" "-a" "dad2c4ce757e656de7d5a0ee6725e78eff7079cb46643f3dae3a1122d46d9335", kill_on_drop: false }`
[INFO] [stderr] warning: unexpected `cfg` condition value: `derive`
[INFO] [stderr]    --> src/traits.rs:125:7
[INFO] [stderr]     |
[INFO] [stderr] 125 | #[cfg(feature = "derive")]
[INFO] [stderr]     |       ^^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stderr]     |
[INFO] [stderr]     = note: no expected values for `feature`
[INFO] [stderr]     = help: consider adding `derive` as a feature in `Cargo.toml`
[INFO] [stderr]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stderr]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `print_coordinates` is never used
[INFO] [stderr]   --> src/main.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn print_coordinates(&(x, y): &(i32, i32)) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Add` is never used
[INFO] [stderr]   --> src/generics.rs:67:7
[INFO] [stderr]    |
[INFO] [stderr] 67 | trait Add<RHS = Self> {
[INFO] [stderr]    |       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/generics.rs:72:20
[INFO] [stderr]    |
[INFO] [stderr] 72 | struct Millimeters(u32);
[INFO] [stderr]    |        ----------- ^^^
[INFO] [stderr]    |        |
[INFO] [stderr]    |        field in this struct
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider removing this field
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Meters` is never constructed
[INFO] [stderr]   --> src/generics.rs:73:8
[INFO] [stderr]    |
[INFO] [stderr] 73 | struct Meters(u32);
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `summarize` and `summary` are never used
[INFO] [stderr]   --> src/traits.rs:10:6
[INFO] [stderr]    |
[INFO] [stderr] 8  | pub trait Summary {
[INFO] [stderr]    |           ------- methods in this trait
[INFO] [stderr] 9  |   /// 方法签名, 必须实现的方法
[INFO] [stderr] 10 |   fn summarize(&self) -> String;
[INFO] [stderr]    |      ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 17 |   fn summary(&self) -> String {
[INFO] [stderr]    |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `News` is never constructed
[INFO] [stderr]   --> src/traits.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 | struct News {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Tweet` is never constructed
[INFO] [stderr]   --> src/traits.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct Tweet {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Wrapper` is never constructed
[INFO] [stderr]   --> src/traits.rs:54:8
[INFO] [stderr]    |
[INFO] [stderr] 54 | struct Wrapper(Vec<String>);
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `OutlinePrint` is never used
[INFO] [stderr]    --> src/traits.rs:133:7
[INFO] [stderr]     |
[INFO] [stderr] 133 | trait OutlinePrint: Display {
[INFO] [stderr]     |       ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `next` is never used
[INFO] [stderr]    --> src/traits.rs:146:6
[INFO] [stderr]     |
[INFO] [stderr] 143 | pub trait AssociatedTypes {
[INFO] [stderr]     |           --------------- method in this trait
[INFO] [stderr] ...
[INFO] [stderr] 146 |   fn next(&mut self) -> Option<Self::Item>;
[INFO] [stderr]     |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `must_use` that must be used
[INFO] [stderr]   --> src/lifecricle.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     format!("{}", another);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this warning originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-scratch` (bin "rust-scratch" test) generated 12 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_scratch-847d47cd6ea57844)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "dad2c4ce757e656de7d5a0ee6725e78eff7079cb46643f3dae3a1122d46d9335", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dad2c4ce757e656de7d5a0ee6725e78eff7079cb46643f3dae3a1122d46d9335", kill_on_drop: false }`
[INFO] [stdout] dad2c4ce757e656de7d5a0ee6725e78eff7079cb46643f3dae3a1122d46d9335