[INFO] cloning repository https://github.com/sabartheman/Rust_huffman_parallel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sabartheman/Rust_huffman_parallel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabartheman%2FRust_huffman_parallel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabartheman%2FRust_huffman_parallel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9856ae702e29f7289fba9dfd14c861fcacf1362d
[INFO] documenting sabartheman/Rust_huffman_parallel against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsabartheman%2FRust_huffman_parallel" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sabartheman/Rust_huffman_parallel on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sabartheman/Rust_huffman_parallel
[INFO] finished tweaking git repo https://github.com/sabartheman/Rust_huffman_parallel
[INFO] tweaked toml for git repo https://github.com/sabartheman/Rust_huffman_parallel written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/sabartheman/Rust_huffman_parallel already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2d95e5397be0c41292f4653ee2eb1b3012a52e3c954d766900913052fb30b300
[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" "2d95e5397be0c41292f4653ee2eb1b3012a52e3c954d766900913052fb30b300", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d95e5397be0c41292f4653ee2eb1b3012a52e3c954d766900913052fb30b300", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d95e5397be0c41292f4653ee2eb1b3012a52e3c954d766900913052fb30b300", kill_on_drop: false }`
[INFO] [stdout] 2d95e5397be0c41292f4653ee2eb1b3012a52e3c954d766900913052fb30b300
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "RUSTDOCFLAGS=--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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--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] a01916cc3aa1c041e50cc20da147aebda67d5663eae1dcd93a19aa43b71d77be
[INFO] running `Command { std: "docker" "start" "-a" "a01916cc3aa1c041e50cc20da147aebda67d5663eae1dcd93a19aa43b71d77be", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.34
[INFO] [stderr]     Checking crossbeam v0.3.0
[INFO] [stderr]     Checking time v0.1.38
[INFO] [stderr]  Documenting huffman_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]    --> src/main.rs:103:32
[INFO] [stdout]     |
[INFO] [stdout] 103 |             assign_codes(l, h, (s.clone() + "0"));
[INFO] [stdout]     |                                ^               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 103 -             assign_codes(l, h, (s.clone() + "0"));
[INFO] [stdout] 103 +             assign_codes(l, h, s.clone() + "0");
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]    --> src/main.rs:106:32
[INFO] [stdout]     |
[INFO] [stdout] 106 |             assign_codes(r, h, (s.clone() + "1"));
[INFO] [stdout]     |                                ^               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 106 -             assign_codes(r, h, (s.clone() + "1"));
[INFO] [stdout] 106 +             assign_codes(r, h, s.clone() + "1");
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.08s
[INFO] running `Command { std: "docker" "inspect" "a01916cc3aa1c041e50cc20da147aebda67d5663eae1dcd93a19aa43b71d77be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a01916cc3aa1c041e50cc20da147aebda67d5663eae1dcd93a19aa43b71d77be", kill_on_drop: false }`
[INFO] [stdout] a01916cc3aa1c041e50cc20da147aebda67d5663eae1dcd93a19aa43b71d77be