[INFO] fetching crate hko 1.6.2...
[INFO] testing hko-1.6.2 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate hko 1.6.2 into /workspace/builds/worker-76/source
[INFO] validating manifest of crates.io crate hko 1.6.2 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hko 1.6.2
[INFO] finished tweaking crates.io crate hko 1.6.2
[INFO] tweaked toml for crates.io crate hko 1.6.2 written to /workspace/builds/worker-76/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 582f63441db95871ef3d0298fbfba793be38d0bc6789b4f92ce6f78888fabd73
[INFO] running `Command { std: "docker" "start" "-a" "582f63441db95871ef3d0298fbfba793be38d0bc6789b4f92ce6f78888fabd73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "582f63441db95871ef3d0298fbfba793be38d0bc6789b4f92ce6f78888fabd73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "582f63441db95871ef3d0298fbfba793be38d0bc6789b4f92ce6f78888fabd73", kill_on_drop: false }`
[INFO] [stdout] 582f63441db95871ef3d0298fbfba793be38d0bc6789b4f92ce6f78888fabd73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-76/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=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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 86adb964fdd38a461e9eccf052ef67dc183a2270875c98b46e5b1fe6f3f92e52
[INFO] running `Command { std: "docker" "start" "-a" "86adb964fdd38a461e9eccf052ef67dc183a2270875c98b46e5b1fe6f3f92e52", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling rustversion v1.0.6
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]    Compiling strum v0.24.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling strum_macros v0.24.0
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling hko v1.6.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(doc_cfg)]
[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 `hko` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "86adb964fdd38a461e9eccf052ef67dc183a2270875c98b46e5b1fe6f3f92e52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86adb964fdd38a461e9eccf052ef67dc183a2270875c98b46e5b1fe6f3f92e52", kill_on_drop: false }`
[INFO] [stdout] 86adb964fdd38a461e9eccf052ef67dc183a2270875c98b46e5b1fe6f3f92e52