[INFO] fetching crate futures-async-combinators 0.3.2...
[INFO] testing futures-async-combinators-0.3.2 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate futures-async-combinators 0.3.2 into /workspace/builds/worker-110/source
[INFO] validating manifest of crates.io crate futures-async-combinators 0.3.2 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 futures-async-combinators 0.3.2
[INFO] finished tweaking crates.io crate futures-async-combinators 0.3.2
[INFO] tweaked toml for crates.io crate futures-async-combinators 0.3.2 written to /workspace/builds/worker-110/source/Cargo.toml
[INFO] crate crates.io crate futures-async-combinators 0.3.2 already has a lockfile, it will not be regenerated
[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-110/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-110/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] 00ac972021a20845957e4410cff538ce5528ba9b7f303c256305578ae3c75543
[INFO] running `Command { std: "docker" "start" "-a" "00ac972021a20845957e4410cff538ce5528ba9b7f303c256305578ae3c75543", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "00ac972021a20845957e4410cff538ce5528ba9b7f303c256305578ae3c75543", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00ac972021a20845957e4410cff538ce5528ba9b7f303c256305578ae3c75543", kill_on_drop: false }`
[INFO] [stdout] 00ac972021a20845957e4410cff538ce5528ba9b7f303c256305578ae3c75543
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-110/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-110/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] 4c5b87d601ab3678271077799516fca512422eab26f6d98491577f1ff23dd334
[INFO] running `Command { std: "docker" "start" "-a" "4c5b87d601ab3678271077799516fca512422eab26f6d98491577f1ff23dd334", 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-async-combinators v0.3.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure, gen_future, generators)]
[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 `futures-async-combinators` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4c5b87d601ab3678271077799516fca512422eab26f6d98491577f1ff23dd334", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c5b87d601ab3678271077799516fca512422eab26f6d98491577f1ff23dd334", kill_on_drop: false }`
[INFO] [stdout] 4c5b87d601ab3678271077799516fca512422eab26f6d98491577f1ff23dd334
