[INFO] cloning repository https://github.com/luisya22/rust_concepts
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/luisya22/rust_concepts" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluisya22%2Frust_concepts", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluisya22%2Frust_concepts'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6ec671ab5c0f9a207f4bbc74582bd3067cbd2523
[INFO] testing luisya22/rust_concepts against try#17092ad00ed8fe1e7f81a7e38238ff70779034b1 for pr-140985
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluisya22%2Frust_concepts" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/luisya22/rust_concepts on toolchain 17092ad00ed8fe1e7f81a7e38238ff70779034b1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/luisya22/rust_concepts
[INFO] finished tweaking git repo https://github.com/luisya22/rust_concepts
[INFO] tweaked toml for git repo https://github.com/luisya22/rust_concepts written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/luisya22/rust_concepts 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" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 74f2afa7fe8c371b542b52146f61219e6872f4a0666dcd51068c914485a940cb
[INFO] running `Command { std: "docker" "start" "-a" "74f2afa7fe8c371b542b52146f61219e6872f4a0666dcd51068c914485a940cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74f2afa7fe8c371b542b52146f61219e6872f4a0666dcd51068c914485a940cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74f2afa7fe8c371b542b52146f61219e6872f4a0666dcd51068c914485a940cb", kill_on_drop: false }`
[INFO] [stdout] 74f2afa7fe8c371b542b52146f61219e6872f4a0666dcd51068c914485a940cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5e3adda812a3ba250770bb588285b76e3937d5f0bb4295bb02916c45b08e72a6
[INFO] running `Command { std: "docker" "start" "-a" "5e3adda812a3ba250770bb588285b76e3937d5f0bb4295bb02916c45b08e72a6", kill_on_drop: false }`
[INFO] [stderr]    Compiling restaurant v0.1.0 (/opt/rustwide/workdir/restaurant)
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> restaurant/src/lib.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> restaurant/src/lib.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> restaurant/src/lib.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn seat_at_table(){
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `server_order` is never used
[INFO] [stdout]   --> restaurant/src/lib.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |         fn server_order(){
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payments` is never used
[INFO] [stdout]   --> restaurant/src/lib.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |         fn take_payments(){
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> restaurant/src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 30 |         pub toast: String,
[INFO] [stdout] 31 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust_concepts v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/patterns_and_matching.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/patterns_and_matching.rs:75:10
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/patterns_and_matching.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/patterns_and_matching.rs:75:16
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns_and_matching.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 175 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 176 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 177 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 178 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "5e3adda812a3ba250770bb588285b76e3937d5f0bb4295bb02916c45b08e72a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e3adda812a3ba250770bb588285b76e3937d5f0bb4295bb02916c45b08e72a6", kill_on_drop: false }`
[INFO] [stdout] 5e3adda812a3ba250770bb588285b76e3937d5f0bb4295bb02916c45b08e72a6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a434cf5a24cf482eb51c5793b32b01c55844a4607af3a94085aa574a87378ae
[INFO] running `Command { std: "docker" "start" "-a" "3a434cf5a24cf482eb51c5793b32b01c55844a4607af3a94085aa574a87378ae", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_concepts v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> restaurant/src/lib.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> restaurant/src/lib.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> restaurant/src/lib.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn seat_at_table(){
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `server_order` is never used
[INFO] [stdout]   --> restaurant/src/lib.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |         fn server_order(){
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payments` is never used
[INFO] [stdout]   --> restaurant/src/lib.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |         fn take_payments(){
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> restaurant/src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 30 |         pub toast: String,
[INFO] [stdout] 31 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/patterns_and_matching.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/patterns_and_matching.rs:75:10
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/patterns_and_matching.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/patterns_and_matching.rs:75:16
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns_and_matching.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 175 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 176 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 177 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 178 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "3a434cf5a24cf482eb51c5793b32b01c55844a4607af3a94085aa574a87378ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a434cf5a24cf482eb51c5793b32b01c55844a4607af3a94085aa574a87378ae", kill_on_drop: false }`
[INFO] [stdout] 3a434cf5a24cf482eb51c5793b32b01c55844a4607af3a94085aa574a87378ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c8267432b4860e6f61256fdb347d64e990be49ad4931d5ec27f838cdb69c5d9b
[INFO] running `Command { std: "docker" "start" "-a" "c8267432b4860e6f61256fdb347d64e990be49ad4931d5ec27f838cdb69c5d9b", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `order1`
[INFO] [stderr]   --> restaurant/src/lib.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `order2`
[INFO] [stderr]   --> restaurant/src/lib.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stderr] 
[INFO] [stderr] warning: function `seat_at_table` is never used
[INFO] [stderr]  --> restaurant/src/lib.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 |         fn seat_at_table(){
[INFO] [stderr]   |            ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `server_order` is never used
[INFO] [stderr]   --> restaurant/src/lib.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 |         fn server_order(){
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `take_payments` is never used
[INFO] [stderr]   --> restaurant/src/lib.rs:22:12
[INFO] [stderr]    |
[INFO] [stderr] 22 |         fn take_payments(){
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `seasonal_fruit` is never read
[INFO] [stderr]   --> restaurant/src/lib.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub struct Breakfast {
[INFO] [stderr]    |                --------- field in this struct
[INFO] [stderr] 30 |         pub toast: String,
[INFO] [stderr] 31 |         seasonal_fruit: String,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `restaurant` (lib) generated 6 warnings
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/patterns_and_matching.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |     let x = 5;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/patterns_and_matching.rs:75:10
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stderr]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/patterns_and_matching.rs:75:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/patterns_and_matching.rs:75:16
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let (x, y, z) = (1, 2, 3);
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stderr]    --> src/patterns_and_matching.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 175 | enum Message {
[INFO] [stderr]     |      ------- variants in this enum
[INFO] [stderr] 176 |     Quit,
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 177 |     Move { x: i32, y: i32 },
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 178 |     Write(String),
[INFO] [stderr]     |     ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_concepts` (bin "rust_concepts" test) generated 5 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_concepts-79ebba7c72bad098)
[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" "c8267432b4860e6f61256fdb347d64e990be49ad4931d5ec27f838cdb69c5d9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8267432b4860e6f61256fdb347d64e990be49ad4931d5ec27f838cdb69c5d9b", kill_on_drop: false }`
[INFO] [stdout] c8267432b4860e6f61256fdb347d64e990be49ad4931d5ec27f838cdb69c5d9b