[INFO] cloning repository https://github.com/banjiaojuhao/srun-helper-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/banjiaojuhao/srun-helper-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbanjiaojuhao%2Fsrun-helper-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbanjiaojuhao%2Fsrun-helper-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6de7c93625001f38e4a3d364e3d36b3cf021b5d6
[INFO] checking banjiaojuhao/srun-helper-rs against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbanjiaojuhao%2Fsrun-helper-rs" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/banjiaojuhao/srun-helper-rs on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/banjiaojuhao/srun-helper-rs
[INFO] finished tweaking git repo https://github.com/banjiaojuhao/srun-helper-rs
[INFO] tweaked toml for git repo https://github.com/banjiaojuhao/srun-helper-rs written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/banjiaojuhao/srun-helper-rs 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded openssl-src v111.16.0+1.1.1l
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 01cfa31aa114254d52cb07283746e159379733b0867f30e4c29b4d7ab933a217
[INFO] running `Command { std: "docker" "start" "-a" "01cfa31aa114254d52cb07283746e159379733b0867f30e4c29b4d7ab933a217", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "01cfa31aa114254d52cb07283746e159379733b0867f30e4c29b4d7ab933a217", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01cfa31aa114254d52cb07283746e159379733b0867f30e4c29b4d7ab933a217", kill_on_drop: false }`
[INFO] [stdout] 01cfa31aa114254d52cb07283746e159379733b0867f30e4c29b4d7ab933a217
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0673ce9be5f45bd363603031b1ccf4af4f3034a1216448b81f842c6f2aa3f715
[INFO] running `Command { std: "docker" "start" "-a" "0673ce9be5f45bd363603031b1ccf4af4f3034a1216448b81f842c6f2aa3f715", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.105
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling cc v1.0.71
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling pkg-config v0.3.22
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling openssl v0.10.36
[INFO] [stderr]     Checking tracing-core v0.1.21
[INFO] [stderr]    Compiling openssl-src v111.16.0+1.1.1l
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking http v0.2.5
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking futures-io v0.3.17
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling futures-channel v0.3.17
[INFO] [stderr]    Compiling httparse v1.5.1
[INFO] [stderr]    Compiling native-tls v0.2.8
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking futures-sink v0.3.17
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]    Compiling openssl-sys v0.9.67
[INFO] [stderr]     Checking tinyvec v1.5.0
[INFO] [stderr]     Checking tracing v0.1.29
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]     Checking openssl-probe v0.1.4
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking socket2 v0.4.2
[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]    Compiling encoding_rs v0.8.29
[INFO] [stderr]     Checking tower-service v0.3.1
[INFO] [stderr]     Checking http-body v0.4.4
[INFO] [stderr]     Checking httpdate v1.0.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling argh_shared v0.1.6
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking ipnet v2.3.1
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking cpufeatures v0.2.1
[INFO] [stderr]     Checking sha-1 v0.9.8
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking md-5 v0.9.1
[INFO] [stderr]     Checking tokio-util v0.6.8
[INFO] [stderr]     Checking h2 v0.3.7
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling argh_derive v0.1.6
[INFO] [stderr]     Checking hyper v0.14.14
[INFO] [stderr]     Checking argh v0.1.6
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.6
[INFO] [stderr]     Checking srun-helper-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex;
[INFO] [stdout]   |     ^^^ the item `hex` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex;
[INFO] [stdout]   |     ^^^ the item `hex` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 33s
[INFO] running `Command { std: "docker" "inspect" "0673ce9be5f45bd363603031b1ccf4af4f3034a1216448b81f842c6f2aa3f715", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0673ce9be5f45bd363603031b1ccf4af4f3034a1216448b81f842c6f2aa3f715", kill_on_drop: false }`
[INFO] [stdout] 0673ce9be5f45bd363603031b1ccf4af4f3034a1216448b81f842c6f2aa3f715
[INFO] checking banjiaojuhao/srun-helper-rs against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbanjiaojuhao%2Fsrun-helper-rs" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/banjiaojuhao/srun-helper-rs on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/banjiaojuhao/srun-helper-rs
[INFO] finished tweaking git repo https://github.com/banjiaojuhao/srun-helper-rs
[INFO] tweaked toml for git repo https://github.com/banjiaojuhao/srun-helper-rs written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/banjiaojuhao/srun-helper-rs 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9accfec4dc578833c2e34f4d20694313b741857653df6b908c3c089bded5373d
[INFO] running `Command { std: "docker" "start" "-a" "9accfec4dc578833c2e34f4d20694313b741857653df6b908c3c089bded5373d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9accfec4dc578833c2e34f4d20694313b741857653df6b908c3c089bded5373d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9accfec4dc578833c2e34f4d20694313b741857653df6b908c3c089bded5373d", kill_on_drop: false }`
[INFO] [stdout] 9accfec4dc578833c2e34f4d20694313b741857653df6b908c3c089bded5373d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a71e71e27b0ac15d8cc686f296ffbbedb18bd3cddf6aaa53fbd9eb2800ab25f
[INFO] running `Command { std: "docker" "start" "-a" "8a71e71e27b0ac15d8cc686f296ffbbedb18bd3cddf6aaa53fbd9eb2800ab25f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.105
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling cc v1.0.71
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling pkg-config v0.3.22
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling openssl v0.10.36
[INFO] [stderr]    Compiling openssl-src v111.16.0+1.1.1l
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]     Checking http v0.2.5
[INFO] [stderr]     Checking tracing-core v0.1.21
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]    Compiling native-tls v0.2.8
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]    Compiling httparse v1.5.1
[INFO] [stderr]     Checking futures-sink v0.3.17
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking futures-io v0.3.17
[INFO] [stderr]    Compiling futures-channel v0.3.17
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling openssl-sys v0.9.67
[INFO] [stderr]     Checking tinyvec v1.5.0
[INFO] [stderr]     Checking tracing v0.1.29
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]     Checking openssl-probe v0.1.4
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking http-body v0.4.4
[INFO] [stderr]     Checking socket2 v0.4.2
[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]     Checking httpdate v1.0.1
[INFO] [stderr]    Compiling encoding_rs v0.8.29
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]     Checking tower-service v0.3.1
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]    Compiling argh_shared v0.1.6
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking ipnet v2.3.1
[INFO] [stderr]     Checking cpufeatures v0.2.1
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]     Checking sha-1 v0.9.8
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking md-5 v0.9.1
[INFO] [stderr]     Checking tokio-util v0.6.8
[INFO] [stderr]     Checking h2 v0.3.7
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking hyper v0.14.14
[INFO] [stderr]    Compiling argh_derive v0.1.6
[INFO] [stderr]     Checking argh v0.1.6
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.6
[INFO] [stderr]     Checking srun-helper-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex;
[INFO] [stdout]   |     ^^^ the item `hex` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex;
[INFO] [stdout]   |     ^^^ the item `hex` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 14s
[INFO] running `Command { std: "docker" "inspect" "8a71e71e27b0ac15d8cc686f296ffbbedb18bd3cddf6aaa53fbd9eb2800ab25f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a71e71e27b0ac15d8cc686f296ffbbedb18bd3cddf6aaa53fbd9eb2800ab25f", kill_on_drop: false }`
[INFO] [stdout] 8a71e71e27b0ac15d8cc686f296ffbbedb18bd3cddf6aaa53fbd9eb2800ab25f