[INFO] cloning repository https://github.com/hardvain/rust-practice [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hardvain/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhardvain%2Frust-practice", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhardvain%2Frust-practice'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] f7ad52d1f6f50a7c945d946f1c36d59100aaf8db [INFO] testing hardvain/rust-practice against beta-2022-04-10 for beta-1.61-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhardvain%2Frust-practice" "/workspace/builds/worker-19/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-19/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/hardvain/rust-practice on toolchain beta-2022-04-10 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/hardvain/rust-practice [INFO] finished tweaking git repo https://github.com/hardvain/rust-practice [INFO] tweaked toml for git repo https://github.com/hardvain/rust-practice written to /workspace/builds/worker-19/source/Cargo.toml [INFO] crate git repo https://github.com/hardvain/rust-practice already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 95db0a130310744d859e259d16a906b9ad0942363335f6facffd21f64a9c26e7 [INFO] running `Command { std: "docker" "start" "-a" "95db0a130310744d859e259d16a906b9ad0942363335f6facffd21f64a9c26e7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "95db0a130310744d859e259d16a906b9ad0942363335f6facffd21f64a9c26e7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "95db0a130310744d859e259d16a906b9ad0942363335f6facffd21f64a9c26e7", kill_on_drop: false }` [INFO] [stdout] 95db0a130310744d859e259d16a906b9ad0942363335f6facffd21f64a9c26e7 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 055797356c9d786bd2424c14f8899e176cbcac5d218a620bf9c24883e3fa89a0 [INFO] running `Command { std: "docker" "start" "-a" "055797356c9d786bd2424c14f8899e176cbcac5d218a620bf9c24883e3fa89a0", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling practice v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:9:24 [INFO] [stdout] | [INFO] [stdout] 9 | fn taking_owned_sample(sample: Sample) {} [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:10:25 [INFO] [stdout] | [INFO] [stdout] 10 | fn taking_shared_sample(sample: &Sample) {} [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:11:26 [INFO] [stdout] | [INFO] [stdout] 11 | fn taking_mutable_sample(sample: &mut Sample) {} [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:37:9 [INFO] [stdout] | [INFO] [stdout] 37 | let sample = Sample { key: 1 }; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:44:9 [INFO] [stdout] | [INFO] [stdout] 44 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:60:9 [INFO] [stdout] | [INFO] [stdout] 60 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:113:9 [INFO] [stdout] | [INFO] [stdout] 113 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:121:9 [INFO] [stdout] | [INFO] [stdout] 121 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:130:9 [INFO] [stdout] | [INFO] [stdout] 130 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:137:9 [INFO] [stdout] | [INFO] [stdout] 137 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `key` [INFO] [stdout] --> src/main.rs:2:3 [INFO] [stdout] | [INFO] [stdout] 2 | key: i32, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `taking_mutable_sample` [INFO] [stdout] --> src/main.rs:11:4 [INFO] [stdout] | [INFO] [stdout] 11 | fn taking_mutable_sample(sample: &mut Sample) {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `mutable_binding_function_calls` [INFO] [stdout] --> src/main.rs:42:4 [INFO] [stdout] | [INFO] [stdout] 42 | fn mutable_binding_function_calls() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.72s [INFO] [stdout] warning: 13 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "055797356c9d786bd2424c14f8899e176cbcac5d218a620bf9c24883e3fa89a0", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "055797356c9d786bd2424c14f8899e176cbcac5d218a620bf9c24883e3fa89a0", kill_on_drop: false }` [INFO] [stdout] 055797356c9d786bd2424c14f8899e176cbcac5d218a620bf9c24883e3fa89a0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 3a155da9c8e90420c6a848379965835e0f8799a2ae4b31776d7f0cd7b6d0b922 [INFO] running `Command { std: "docker" "start" "-a" "3a155da9c8e90420c6a848379965835e0f8799a2ae4b31776d7f0cd7b6d0b922", kill_on_drop: false }` [INFO] [stderr] Compiling practice v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:9:24 [INFO] [stdout] | [INFO] [stdout] 9 | fn taking_owned_sample(sample: Sample) {} [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:10:25 [INFO] [stdout] | [INFO] [stdout] 10 | fn taking_shared_sample(sample: &Sample) {} [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:11:26 [INFO] [stdout] | [INFO] [stdout] 11 | fn taking_mutable_sample(sample: &mut Sample) {} [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sample` [INFO] [stdout] --> src/main.rs:37:9 [INFO] [stdout] | [INFO] [stdout] 37 | let sample = Sample { key: 1 }; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:44:9 [INFO] [stdout] | [INFO] [stdout] 44 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:60:9 [INFO] [stdout] | [INFO] [stdout] 60 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:113:9 [INFO] [stdout] | [INFO] [stdout] 113 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:121:9 [INFO] [stdout] | [INFO] [stdout] 121 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:130:9 [INFO] [stdout] | [INFO] [stdout] 130 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:137:9 [INFO] [stdout] | [INFO] [stdout] 137 | let mut sample = Sample { key: 1 }; [INFO] [stdout] | ----^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `key` [INFO] [stdout] --> src/main.rs:2:3 [INFO] [stdout] | [INFO] [stdout] 2 | key: i32, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `taking_mutable_sample` [INFO] [stdout] --> src/main.rs:11:4 [INFO] [stdout] | [INFO] [stdout] 11 | fn taking_mutable_sample(sample: &mut Sample) {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `mutable_binding_function_calls` [INFO] [stdout] --> src/main.rs:42:4 [INFO] [stdout] | [INFO] [stdout] 42 | fn mutable_binding_function_calls() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 13 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.36s [INFO] [stderr] Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/practice-a7ce34a08eb68210) [INFO] running `Command { std: "docker" "inspect" "3a155da9c8e90420c6a848379965835e0f8799a2ae4b31776d7f0cd7b6d0b922", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3a155da9c8e90420c6a848379965835e0f8799a2ae4b31776d7f0cd7b6d0b922", kill_on_drop: false }` [INFO] [stdout] 3a155da9c8e90420c6a848379965835e0f8799a2ae4b31776d7f0cd7b6d0b922 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] df754be0eb6e2a98147f7b1d2fde9de8a939dc175c2652fdc4fb3b515b578240 [INFO] running `Command { std: "docker" "start" "-a" "df754be0eb6e2a98147f7b1d2fde9de8a939dc175c2652fdc4fb3b515b578240", kill_on_drop: false }` [INFO] [stderr] warning: unused variable: `sample` [INFO] [stderr] --> src/main.rs:9:24 [INFO] [stderr] | [INFO] [stderr] 9 | fn taking_owned_sample(sample: Sample) {} [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sample` [INFO] [stderr] --> src/main.rs:10:25 [INFO] [stderr] | [INFO] [stderr] 10 | fn taking_shared_sample(sample: &Sample) {} [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sample` [INFO] [stderr] --> src/main.rs:11:26 [INFO] [stderr] | [INFO] [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {} [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sample` [INFO] [stderr] --> src/main.rs:37:9 [INFO] [stderr] | [INFO] [stderr] 37 | let sample = Sample { key: 1 }; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sample` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:44:9 [INFO] [stderr] | [INFO] [stderr] 44 | let mut sample = Sample { key: 1 }; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:60:9 [INFO] [stderr] | [INFO] [stderr] 60 | let mut sample = Sample { key: 1 }; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:113:9 [INFO] [stderr] | [INFO] [stderr] 113 | let mut sample = Sample { key: 1 }; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:121:9 [INFO] [stderr] | [INFO] [stderr] 121 | let mut sample = Sample { key: 1 }; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:130:9 [INFO] [stderr] | [INFO] [stderr] 130 | let mut sample = Sample { key: 1 }; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:137:9 [INFO] [stderr] | [INFO] [stderr] 137 | let mut sample = Sample { key: 1 }; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: field is never read: `key` [INFO] [stderr] --> src/main.rs:2:3 [INFO] [stderr] | [INFO] [stderr] 2 | key: i32, [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `taking_mutable_sample` [INFO] [stderr] --> src/main.rs:11:4 [INFO] [stderr] | [INFO] [stderr] 11 | fn taking_mutable_sample(sample: &mut Sample) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `mutable_binding_function_calls` [INFO] [stderr] --> src/main.rs:42:4 [INFO] [stderr] | [INFO] [stderr] 42 | fn mutable_binding_function_calls() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: `practice` (bin "practice" test) generated 13 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.00s [INFO] [stderr] Running unittests src/main.rs (/opt/rustwide/target/debug/deps/practice-a7ce34a08eb68210) [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" "df754be0eb6e2a98147f7b1d2fde9de8a939dc175c2652fdc4fb3b515b578240", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "df754be0eb6e2a98147f7b1d2fde9de8a939dc175c2652fdc4fb3b515b578240", kill_on_drop: false }` [INFO] [stdout] df754be0eb6e2a98147f7b1d2fde9de8a939dc175c2652fdc4fb3b515b578240