[INFO] fetching crate system-call 0.1.3...
[INFO] testing system-call-0.1.3 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate system-call 0.1.3 into /workspace/builds/worker-76/source
[INFO] validating manifest of crates.io crate system-call 0.1.3 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 system-call 0.1.3
[INFO] finished tweaking crates.io crate system-call 0.1.3
[INFO] tweaked toml for crates.io crate system-call 0.1.3 written to /workspace/builds/worker-76/source/Cargo.toml
[INFO] crate crates.io crate system-call 0.1.3 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] 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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ca40340e49674957392f87f35382c80b6c31abfd41376fafdda9287c8635cce0
[INFO] running `Command { std: "docker" "start" "-a" "ca40340e49674957392f87f35382c80b6c31abfd41376fafdda9287c8635cce0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca40340e49674957392f87f35382c80b6c31abfd41376fafdda9287c8635cce0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca40340e49674957392f87f35382c80b6c31abfd41376fafdda9287c8635cce0", kill_on_drop: false }`
[INFO] [stdout] ca40340e49674957392f87f35382c80b6c31abfd41376fafdda9287c8635cce0
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 449650ea4e7310d5b5ab575c53390f59bab18b6329d1b6574bd07c5d54637719
[INFO] running `Command { std: "docker" "start" "-a" "449650ea4e7310d5b5ab575c53390f59bab18b6329d1b6574bd07c5d54637719", kill_on_drop: false }`
[INFO] [stderr]    Compiling system-call v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(llvm_asm)]
[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 `system-call` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "449650ea4e7310d5b5ab575c53390f59bab18b6329d1b6574bd07c5d54637719", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "449650ea4e7310d5b5ab575c53390f59bab18b6329d1b6574bd07c5d54637719", kill_on_drop: false }`
[INFO] [stdout] 449650ea4e7310d5b5ab575c53390f59bab18b6329d1b6574bd07c5d54637719
