[INFO] cloning repository https://github.com/bon-chi/tower_of_hanoi_in_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bon-chi/tower_of_hanoi_in_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Ftower_of_hanoi_in_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Ftower_of_hanoi_in_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6db73d2b8c4a3dffb5c55025cbf3bd44d5188ab2
[INFO] checking bon-chi/tower_of_hanoi_in_rust against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Ftower_of_hanoi_in_rust" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bon-chi/tower_of_hanoi_in_rust on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bon-chi/tower_of_hanoi_in_rust
[INFO] finished tweaking git repo https://github.com/bon-chi/tower_of_hanoi_in_rust
[INFO] tweaked toml for git repo https://github.com/bon-chi/tower_of_hanoi_in_rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/bon-chi/tower_of_hanoi_in_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3894e0316921b3d542769d4f46e040341506f5a59afb1c5f12a81b61a3337f6e
[INFO] running `Command { std: "docker" "start" "-a" "3894e0316921b3d542769d4f46e040341506f5a59afb1c5f12a81b61a3337f6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3894e0316921b3d542769d4f46e040341506f5a59afb1c5f12a81b61a3337f6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3894e0316921b3d542769d4f46e040341506f5a59afb1c5f12a81b61a3337f6e", kill_on_drop: false }`
[INFO] [stdout] 3894e0316921b3d542769d4f46e040341506f5a59afb1c5f12a81b61a3337f6e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f3e5c14c9f2463cd00ad6fe168b9475e8ed5c677961186bc10d4e22056cac59e
[INFO] running `Command { std: "docker" "start" "-a" "f3e5c14c9f2463cd00ad6fe168b9475e8ed5c677961186bc10d4e22056cac59e", kill_on_drop: false }`
[INFO] [stderr]     Checking tower_of_hanoi_in_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut new_stream: &mut Vec<i32> = &mut hanoi_stream(n - 1, h1);
[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:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut new_stream: &mut Vec<i32> = &mut hanoi_stream(n - 1, h1);
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.32s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f3e5c14c9f2463cd00ad6fe168b9475e8ed5c677961186bc10d4e22056cac59e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3e5c14c9f2463cd00ad6fe168b9475e8ed5c677961186bc10d4e22056cac59e", kill_on_drop: false }`
[INFO] [stdout] f3e5c14c9f2463cd00ad6fe168b9475e8ed5c677961186bc10d4e22056cac59e