[INFO] cloning repository https://github.com/rcoverick/rust_dailyprogrammer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rcoverick/rust_dailyprogrammer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frcoverick%2Frust_dailyprogrammer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frcoverick%2Frust_dailyprogrammer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7eba5007eb1ec145617b2771d020da0663dd7473
[INFO] documenting rcoverick/rust_dailyprogrammer against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frcoverick%2Frust_dailyprogrammer" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rcoverick/rust_dailyprogrammer on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rcoverick/rust_dailyprogrammer
[INFO] finished tweaking git repo https://github.com/rcoverick/rust_dailyprogrammer
[INFO] tweaked toml for git repo https://github.com/rcoverick/rust_dailyprogrammer written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/rcoverick/rust_dailyprogrammer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d770957d7b6a2012afc852cda4b7f7e0c98fa06024c53cccf4452e638b65604b
[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" "d770957d7b6a2012afc852cda4b7f7e0c98fa06024c53cccf4452e638b65604b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d770957d7b6a2012afc852cda4b7f7e0c98fa06024c53cccf4452e638b65604b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d770957d7b6a2012afc852cda4b7f7e0c98fa06024c53cccf4452e638b65604b", kill_on_drop: false }`
[INFO] [stdout] d770957d7b6a2012afc852cda4b7f7e0c98fa06024c53cccf4452e638b65604b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74042f6e1620a5be66e2bc9afdda31fd3d95b66f4bf2285040bab3964d7c5d2c
[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" "74042f6e1620a5be66e2bc9afdda31fd3d95b66f4bf2285040bab3964d7c5d2c", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.21
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking time v0.1.36
[INFO] [stderr]  Documenting dailyprogrammer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]   --> src/challenge/intermediate/pgm_manipulation.rs:20:32
[INFO] [stdout]    |
[INFO] [stdout] 20 |     io::stdin().read_to_string((&mut buf)).unwrap();
[INFO] [stdout]    |                                ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` 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 3.76s
[INFO] running `Command { std: "docker" "inspect" "74042f6e1620a5be66e2bc9afdda31fd3d95b66f4bf2285040bab3964d7c5d2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74042f6e1620a5be66e2bc9afdda31fd3d95b66f4bf2285040bab3964d7c5d2c", kill_on_drop: false }`
[INFO] [stdout] 74042f6e1620a5be66e2bc9afdda31fd3d95b66f4bf2285040bab3964d7c5d2c