[INFO] cloning repository https://github.com/friendbear/stepByStepRust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/friendbear/stepByStepRust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffriendbear%2FstepByStepRust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffriendbear%2FstepByStepRust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dc045f3e4c69e97a6eda85d500c59c754c76c844
[INFO] checking friendbear/stepByStepRust against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffriendbear%2FstepByStepRust" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/friendbear/stepByStepRust on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/friendbear/stepByStepRust
[INFO] finished tweaking git repo https://github.com/friendbear/stepByStepRust
[INFO] tweaked toml for git repo https://github.com/friendbear/stepByStepRust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/friendbear/stepByStepRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d1696105485fecb4521579b037a2cd5d18729390b09eff4abc73465a8faf9bfa
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d1696105485fecb4521579b037a2cd5d18729390b09eff4abc73465a8faf9bfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d1696105485fecb4521579b037a2cd5d18729390b09eff4abc73465a8faf9bfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1696105485fecb4521579b037a2cd5d18729390b09eff4abc73465a8faf9bfa", kill_on_drop: false }`
[INFO] [stdout] d1696105485fecb4521579b037a2cd5d18729390b09eff4abc73465a8faf9bfa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fee9bd13e91c74519d5e28b444d32f6fce04fc4f086387ebc0ac6e33f0be114c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fee9bd13e91c74519d5e28b444d32f6fce04fc4f086387ebc0ac6e33f0be114c", kill_on_drop: false }`
[INFO] [stderr]     Checking hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `main_dummy`
[INFO] [stdout]  --> src/main.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main_dummy() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `language`
[INFO] [stdout]  --> src/main.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn language() -> String {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         writeln!(std::io::stderr(), "Usage; gcd NUMBER ...");
[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]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main_dummy`
[INFO] [stdout]  --> src/main.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main_dummy() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         writeln!(std::io::stderr(), "Usage; gcd NUMBER ...");
[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]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `Command { std: "docker" "inspect" "fee9bd13e91c74519d5e28b444d32f6fce04fc4f086387ebc0ac6e33f0be114c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fee9bd13e91c74519d5e28b444d32f6fce04fc4f086387ebc0ac6e33f0be114c", kill_on_drop: false }`
[INFO] [stdout] fee9bd13e91c74519d5e28b444d32f6fce04fc4f086387ebc0ac6e33f0be114c