[INFO] cloning repository https://github.com/tomasol/chat-async
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tomasol/chat-async" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomasol%2Fchat-async", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomasol%2Fchat-async'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f9964e62e8fd5b0981732e7832e0523269e4b60
[INFO] testing tomasol/chat-async against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomasol%2Fchat-async" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tomasol/chat-async on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-10/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/tomasol/chat-async
[INFO] finished tweaking git repo https://github.com/tomasol/chat-async
[INFO] tweaked toml for git repo https://github.com/tomasol/chat-async written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/tomasol/chat-async already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded streamunordered v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 44eab1e310ffa5594eb3ab72b2a585a44c97fd47e4db094d946cc8937e22569d
[INFO] running `Command { std: "docker" "start" "-a" "44eab1e310ffa5594eb3ab72b2a585a44c97fd47e4db094d946cc8937e22569d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44eab1e310ffa5594eb3ab72b2a585a44c97fd47e4db094d946cc8937e22569d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44eab1e310ffa5594eb3ab72b2a585a44c97fd47e4db094d946cc8937e22569d", kill_on_drop: false }`
[INFO] [stdout] 44eab1e310ffa5594eb3ab72b2a585a44c97fd47e4db094d946cc8937e22569d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8131d26c5a63864676ceed252eb88bcb9280be91600d52f873546ac0e4813205
[INFO] running `Command { std: "docker" "start" "-a" "8131d26c5a63864676ceed252eb88bcb9280be91600d52f873546ac0e4813205", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling futures-channel v0.3.1
[INFO] [stderr]    Compiling async-task v1.0.0
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling mio v0.6.21
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling async-std v1.4.0
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]    Compiling futures-util v0.3.1
[INFO] [stderr]    Compiling futures-executor v0.3.1
[INFO] [stderr]    Compiling streamunordered v0.5.0
[INFO] [stderr]    Compiling futures v0.3.1
[INFO] [stderr]    Compiling chat-async v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[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 `chat-async` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "8131d26c5a63864676ceed252eb88bcb9280be91600d52f873546ac0e4813205", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8131d26c5a63864676ceed252eb88bcb9280be91600d52f873546ac0e4813205", kill_on_drop: false }`
[INFO] [stdout] 8131d26c5a63864676ceed252eb88bcb9280be91600d52f873546ac0e4813205