[INFO] fetching crate docbot 0.3.0-alpha.2...
[INFO] testing docbot-0.3.0-alpha.2 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate docbot 0.3.0-alpha.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate docbot 0.3.0-alpha.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 docbot 0.3.0-alpha.2
[INFO] finished tweaking crates.io crate docbot 0.3.0-alpha.2
[INFO] tweaked toml for crates.io crate docbot 0.3.0-alpha.2 written to /workspace/builds/worker-4/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded docbot-derive v0.3.0-alpha.2
[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" "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] a557ac4fd97ec6ee5d27d9a84776e0551eefaf5697a283548077a0b41bd458d2
[INFO] running `Command { std: "docker" "start" "-a" "a557ac4fd97ec6ee5d27d9a84776e0551eefaf5697a283548077a0b41bd458d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a557ac4fd97ec6ee5d27d9a84776e0551eefaf5697a283548077a0b41bd458d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a557ac4fd97ec6ee5d27d9a84776e0551eefaf5697a283548077a0b41bd458d2", kill_on_drop: false }`
[INFO] [stdout] a557ac4fd97ec6ee5d27d9a84776e0551eefaf5697a283548077a0b41bd458d2
[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=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] b16b01b3e736bdb9151a4e7851a442abc33bf443122bef84683316c06e17bc8b
[INFO] running `Command { std: "docker" "start" "-a" "b16b01b3e736bdb9151a4e7851a442abc33bf443122bef84683316c06e17bc8b", kill_on_drop: false }`
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling docbot-derive v0.3.0-alpha.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/docbot-derive-0.3.0-alpha.2/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_diagnostic)]
[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 `docbot-derive` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "b16b01b3e736bdb9151a4e7851a442abc33bf443122bef84683316c06e17bc8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b16b01b3e736bdb9151a4e7851a442abc33bf443122bef84683316c06e17bc8b", kill_on_drop: false }`
[INFO] [stdout] b16b01b3e736bdb9151a4e7851a442abc33bf443122bef84683316c06e17bc8b