[INFO] cloning repository https://github.com/fieldlee/rust-learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fieldlee/rust-learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffieldlee%2Frust-learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffieldlee%2Frust-learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 736dfc9ecb8518bd4940c9a1f6dd7765a38b47f2
[INFO] checking fieldlee/rust-learn against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffieldlee%2Frust-learn" "/workspace/builds/worker-71/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-71/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fieldlee/rust-learn on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fieldlee/rust-learn
[INFO] finished tweaking git repo https://github.com/fieldlee/rust-learn
[INFO] tweaked toml for git repo https://github.com/fieldlee/rust-learn written to /workspace/builds/worker-71/source/Cargo.toml
[INFO] crate git repo https://github.com/fieldlee/rust-learn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "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-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb121ef456e0da178f470b9010f040a3ab75a4ba54ac12880e55c7bb93b741fa
[INFO] running `Command { std: "docker" "start" "-a" "eb121ef456e0da178f470b9010f040a3ab75a4ba54ac12880e55c7bb93b741fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb121ef456e0da178f470b9010f040a3ab75a4ba54ac12880e55c7bb93b741fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb121ef456e0da178f470b9010f040a3ab75a4ba54ac12880e55c7bb93b741fa", kill_on_drop: false }`
[INFO] [stdout] eb121ef456e0da178f470b9010f040a3ab75a4ba54ac12880e55c7bb93b741fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6241128d0e14f1bf750737ca19346e6779de30f4a798c3ff329ab071d888fe72
[INFO] running `Command { std: "docker" "start" "-a" "6241128d0e14f1bf750737ca19346e6779de30f4a798c3ff329ab071d888fe72", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking file_common v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/hash_map.rs (1 fix)
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn foo(){
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Carrot`
[INFO] [stdout]  --> src/commap.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Carrot,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Potato`
[INFO] [stdout]  --> src/commap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Potato,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Pork`
[INFO] [stdout]  --> src/commap.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Pork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sheep`
[INFO] [stdout]   --> src/commap.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Sheep,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `peel`
[INFO] [stdout]   --> src/commap.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn peel(food : Option<Food>,meat :Option<Meat>)->Option<Peeled>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cookable_v1`
[INFO] [stdout]   --> src/and_then.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn cookable_v1(food:Food)->Option<Food>{
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiply`
[INFO] [stdout]  --> src/twoparse.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn multiply(first_num_str:&str, second_num_str:&str) -> Result<usize,ParseIntError>{
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]  --> src/define_err.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | type Result<T> = std::result::Result<T,T>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `NTHEARD`
[INFO] [stdout]  --> src/thread.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const NTHEARD:i32 = 10;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `spawn`
[INFO] [stdout]  --> src/thread.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn spawn(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/thread.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         child.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn foo(){
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Carrot`
[INFO] [stdout]  --> src/commap.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Carrot,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Potato`
[INFO] [stdout]  --> src/commap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Potato,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Pork`
[INFO] [stdout]  --> src/commap.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Pork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sheep`
[INFO] [stdout]   --> src/commap.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Sheep,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `peel`
[INFO] [stdout]   --> src/commap.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn peel(food : Option<Food>,meat :Option<Meat>)->Option<Peeled>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cookable_v1`
[INFO] [stdout]   --> src/and_then.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn cookable_v1(food:Food)->Option<Food>{
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiply`
[INFO] [stdout]  --> src/twoparse.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn multiply(first_num_str:&str, second_num_str:&str) -> Result<usize,ParseIntError>{
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]  --> src/define_err.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | type Result<T> = std::result::Result<T,T>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `NTHEARD`
[INFO] [stdout]  --> src/thread.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const NTHEARD:i32 = 10;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `spawn`
[INFO] [stdout]  --> src/thread.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn spawn(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/thread.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         child.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.15s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking file_common v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn foo(){
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Carrot`
[INFO] [stdout]  --> src/commap.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Carrot,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Potato`
[INFO] [stdout]  --> src/commap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Potato,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Pork`
[INFO] [stdout]  --> src/commap.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Pork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sheep`
[INFO] [stdout]   --> src/commap.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Sheep,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `peel`
[INFO] [stdout]   --> src/commap.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn peel(food : Option<Food>,meat :Option<Meat>)->Option<Peeled>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cookable_v1`
[INFO] [stdout]   --> src/and_then.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn cookable_v1(food:Food)->Option<Food>{
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiply`
[INFO] [stdout]  --> src/twoparse.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn multiply(first_num_str:&str, second_num_str:&str) -> Result<usize,ParseIntError>{
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]  --> src/define_err.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | type Result<T> = std::result::Result<T,T>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `NTHEARD`
[INFO] [stdout]  --> src/thread.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const NTHEARD:i32 = 10;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `spawn`
[INFO] [stdout]  --> src/thread.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn spawn(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn foo(){
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Carrot`
[INFO] [stdout]  --> src/commap.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Carrot,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Potato`
[INFO] [stdout]  --> src/commap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Potato,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Pork`
[INFO] [stdout]  --> src/commap.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Pork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Sheep`
[INFO] [stdout]   --> src/commap.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Sheep,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `peel`
[INFO] [stdout]   --> src/commap.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn peel(food : Option<Food>,meat :Option<Meat>)->Option<Peeled>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cookable_v1`
[INFO] [stdout]   --> src/and_then.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn cookable_v1(food:Food)->Option<Food>{
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiply`
[INFO] [stdout]  --> src/twoparse.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn multiply(first_num_str:&str, second_num_str:&str) -> Result<usize,ParseIntError>{
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]  --> src/define_err.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | type Result<T> = std::result::Result<T,T>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `NTHEARD`
[INFO] [stdout]  --> src/thread.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const NTHEARD:i32 = 10;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `spawn`
[INFO] [stdout]  --> src/thread.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn spawn(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/thread.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         child.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/thread.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         child.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "6241128d0e14f1bf750737ca19346e6779de30f4a798c3ff329ab071d888fe72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6241128d0e14f1bf750737ca19346e6779de30f4a798c3ff329ab071d888fe72", kill_on_drop: false }`
[INFO] [stdout] 6241128d0e14f1bf750737ca19346e6779de30f4a798c3ff329ab071d888fe72