[INFO] cloning repository https://github.com/lolgeny/advent_of_code_2020
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lolgeny/advent_of_code_2020" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flolgeny%2Fadvent_of_code_2020", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flolgeny%2Fadvent_of_code_2020'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a0062cbc407f184dd42a555f20e6ccbf9912f8c4
[INFO] documenting lolgeny/advent_of_code_2020 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flolgeny%2Fadvent_of_code_2020" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lolgeny/advent_of_code_2020 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/lolgeny/advent_of_code_2020
[INFO] finished tweaking git repo https://github.com/lolgeny/advent_of_code_2020
[INFO] tweaked toml for git repo https://github.com/lolgeny/advent_of_code_2020 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/lolgeny/advent_of_code_2020 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 61627f058b24713a889b40b5b02360ff8fae5a513f3451dbf6bcb19635d58ce0
[INFO] running `Command { std: "docker" "start" "-a" "61627f058b24713a889b40b5b02360ff8fae5a513f3451dbf6bcb19635d58ce0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61627f058b24713a889b40b5b02360ff8fae5a513f3451dbf6bcb19635d58ce0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61627f058b24713a889b40b5b02360ff8fae5a513f3451dbf6bcb19635d58ce0", kill_on_drop: false }`
[INFO] [stdout] 61627f058b24713a889b40b5b02360ff8fae5a513f3451dbf6bcb19635d58ce0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be8376009119d9e98ec6696f51663ef2806a47d244b1ca79ddd91dca4ba8b676
[INFO] running `Command { std: "docker" "start" "-a" "be8376009119d9e98ec6696f51663ef2806a47d244b1ca79ddd91dca4ba8b676", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling const_fn v0.4.4
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]    Compiling cache v0.1.0 (/opt/rustwide/workdir/src/aoc/cache)
[INFO] [stderr]     Checking aoc v0.1.0 (/opt/rustwide/workdir/src/aoc)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/aoc/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trace_macros)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `aoc` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "be8376009119d9e98ec6696f51663ef2806a47d244b1ca79ddd91dca4ba8b676", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be8376009119d9e98ec6696f51663ef2806a47d244b1ca79ddd91dca4ba8b676", kill_on_drop: false }`
[INFO] [stdout] be8376009119d9e98ec6696f51663ef2806a47d244b1ca79ddd91dca4ba8b676