[INFO] fetching crate meow_forth 0.1.0...
[INFO] testing meow_forth-0.1.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate meow_forth 0.1.0 into /workspace/builds/worker-60/source
[INFO] validating manifest of crates.io crate meow_forth 0.1.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate meow_forth 0.1.0
[INFO] finished tweaking crates.io crate meow_forth 0.1.0
[INFO] tweaked toml for crates.io crate meow_forth 0.1.0 written to /workspace/builds/worker-60/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 091d44b417b15a36464b5ea63542f1616aa22a91c89e87f50e894efb5b224455
[INFO] running `Command { std: "docker" "start" "-a" "091d44b417b15a36464b5ea63542f1616aa22a91c89e87f50e894efb5b224455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "091d44b417b15a36464b5ea63542f1616aa22a91c89e87f50e894efb5b224455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "091d44b417b15a36464b5ea63542f1616aa22a91c89e87f50e894efb5b224455", kill_on_drop: false }`
[INFO] [stdout] 091d44b417b15a36464b5ea63542f1616aa22a91c89e87f50e894efb5b224455
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e820637e1fa1ebf03bd72dc7557961d8146c55554da9d1d018d8486478202029
[INFO] running `Command { std: "docker" "start" "-a" "e820637e1fa1ebf03bd72dc7557961d8146c55554da9d1d018d8486478202029", kill_on_drop: false }`
[INFO] [stderr]    Compiling meow_forth v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(alloc_prelude)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::prelude::v1 as alloc_prelude`
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::prelude::v1 as alloc_prelude;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `meow_forth` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "e820637e1fa1ebf03bd72dc7557961d8146c55554da9d1d018d8486478202029", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e820637e1fa1ebf03bd72dc7557961d8146c55554da9d1d018d8486478202029", kill_on_drop: false }`
[INFO] [stdout] e820637e1fa1ebf03bd72dc7557961d8146c55554da9d1d018d8486478202029
