[INFO] cloning repository https://github.com/tam159/rust_udemy_beginner
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tam159/rust_udemy_beginner" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftam159%2Frust_udemy_beginner", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftam159%2Frust_udemy_beginner'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 554a02ffcea4e1b7ccda29f45fd7a06ae2b71048
[INFO] checking tam159/rust_udemy_beginner against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftam159%2Frust_udemy_beginner" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tam159/rust_udemy_beginner on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tam159/rust_udemy_beginner
[INFO] finished tweaking git repo https://github.com/tam159/rust_udemy_beginner
[INFO] tweaked toml for git repo https://github.com/tam159/rust_udemy_beginner written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tam159/rust_udemy_beginner 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" "+b0696a5160711c068cb1f01b7437db7990d15750" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking tam159/rust_udemy_beginner against try#bfe97fcae016881ad333f0ff8cea2cadb9cf136c for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftam159%2Frust_udemy_beginner" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tam159/rust_udemy_beginner on toolchain bfe97fcae016881ad333f0ff8cea2cadb9cf136c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tam159/rust_udemy_beginner
[INFO] finished tweaking git repo https://github.com/tam159/rust_udemy_beginner
[INFO] tweaked toml for git repo https://github.com/tam159/rust_udemy_beginner written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tam159/rust_udemy_beginner 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" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking tam159/rust_udemy_beginner against try#bfe97fcae016881ad333f0ff8cea2cadb9cf136c for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftam159%2Frust_udemy_beginner" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tam159/rust_udemy_beginner on toolchain bfe97fcae016881ad333f0ff8cea2cadb9cf136c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tam159/rust_udemy_beginner
[INFO] finished tweaking git repo https://github.com/tam159/rust_udemy_beginner
[INFO] tweaked toml for git repo https://github.com/tam159/rust_udemy_beginner written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tam159/rust_udemy_beginner 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" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cfc7b14f5dea95f5575ad47114a723f3bc5fe0ed62cc6f3e3f207edbfd927865
[INFO] running `Command { std: "docker" "start" "-a" "cfc7b14f5dea95f5575ad47114a723f3bc5fe0ed62cc6f3e3f207edbfd927865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cfc7b14f5dea95f5575ad47114a723f3bc5fe0ed62cc6f3e3f207edbfd927865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cfc7b14f5dea95f5575ad47114a723f3bc5fe0ed62cc6f3e3f207edbfd927865", kill_on_drop: false }`
[INFO] [stdout] cfc7b14f5dea95f5575ad47114a723f3bc5fe0ed62cc6f3e3f207edbfd927865
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a9ae23db06f1dcc1cda799a40f428115c6a1694dadcaf6e626b19bf75830884
[INFO] running `Command { std: "docker" "start" "-a" "7a9ae23db06f1dcc1cda799a40f428115c6a1694dadcaf6e626b19bf75830884", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rust_udemy_beginner v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `Blue` is never constructed
[INFO] [stdout]   --> src/sample_enum.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Colors {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 18 |     Blue,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Colors` 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]   --> src/sample_enum.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Name(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[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] 23 |     Name(()),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Surname` and `Age` are never constructed
[INFO] [stdout]   --> src/sample_enum.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | enum Person {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] 23 |     Name(String),
[INFO] [stdout] 24 |     Surname(String),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 25 |     Age(i32),
[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: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/sample_errors.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/sample_generic.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Point<T> {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 22 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 23 |     y: T,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Blue` and `Green` are never constructed
[INFO] [stdout]   --> src/sample_generic.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum Colors<T> {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] 28 |     Red(T),
[INFO] [stdout] 29 |     Blue(T),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 30 |     Green(T),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Colors` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/sample_generic.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Point2<T, V> {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 35 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 36 |     y: V,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Point2` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `owner` are never read
[INFO] [stdout]   --> src/sample_memory.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct Dog<'l> {
[INFO] [stdout]    |        --- fields in this struct
[INFO] [stdout] 60 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 61 |     owner: &'l Person, // Define the same lifetime for both Dog and Person
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dog` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `awesome` is never read
[INFO] [stdout]  --> src/sample_traits.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct RustDev {
[INFO] [stdout]   |        ------- field in this struct
[INFO] [stdout] 7 |     awesome: bool,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `awsome` is never read
[INFO] [stdout]   --> src/sample_traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct JavaDev {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 11 |     awsome: bool,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `color` is never read
[INFO] [stdout]   --> src/sample_traits.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Cat {
[INFO] [stdout]    |        --- field in this struct
[INFO] [stdout] 71 |     color: &'static str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused closure that must be used
[INFO] [stdout]    --> src/main.rs:133:5
[INFO] [stdout]     |
[INFO] [stdout] 133 |     |a: i32, b: i32| println!("{}", a + b);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: closures are lazy and do nothing unless called
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Blue` is never constructed
[INFO] [stdout]   --> src/sample_enum.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Colors {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 18 |     Blue,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Colors` 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]   --> src/sample_enum.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Name(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[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] 23 |     Name(()),
[INFO] [stdout]    |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Surname` and `Age` are never constructed
[INFO] [stdout]   --> src/sample_enum.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | enum Person {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] 23 |     Name(String),
[INFO] [stdout] 24 |     Surname(String),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 25 |     Age(i32),
[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: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/sample_errors.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/sample_generic.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Point<T> {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 22 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 23 |     y: T,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Blue` and `Green` are never constructed
[INFO] [stdout]   --> src/sample_generic.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum Colors<T> {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] 28 |     Red(T),
[INFO] [stdout] 29 |     Blue(T),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 30 |     Green(T),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Colors` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/sample_generic.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Point2<T, V> {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 35 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 36 |     y: V,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Point2` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `owner` are never read
[INFO] [stdout]   --> src/sample_memory.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct Dog<'l> {
[INFO] [stdout]    |        --- fields in this struct
[INFO] [stdout] 60 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 61 |     owner: &'l Person, // Define the same lifetime for both Dog and Person
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Dog` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `awesome` is never read
[INFO] [stdout]  --> src/sample_traits.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct RustDev {
[INFO] [stdout]   |        ------- field in this struct
[INFO] [stdout] 7 |     awesome: bool,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `awsome` is never read
[INFO] [stdout]   --> src/sample_traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct JavaDev {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 11 |     awsome: bool,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `color` is never read
[INFO] [stdout]   --> src/sample_traits.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Cat {
[INFO] [stdout]    |        --- field in this struct
[INFO] [stdout] 71 |     color: &'static str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused closure that must be used
[INFO] [stdout]    --> src/main.rs:133:5
[INFO] [stdout]     |
[INFO] [stdout] 133 |     |a: i32, b: i32| println!("{}", a + b);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: closures are lazy and do nothing unless called
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.70s
[INFO] running `Command { std: "docker" "inspect" "7a9ae23db06f1dcc1cda799a40f428115c6a1694dadcaf6e626b19bf75830884", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a9ae23db06f1dcc1cda799a40f428115c6a1694dadcaf6e626b19bf75830884", kill_on_drop: false }`
[INFO] [stdout] 7a9ae23db06f1dcc1cda799a40f428115c6a1694dadcaf6e626b19bf75830884
