[INFO] fetching crate dumbnet 0.1.0...
[INFO] testing dumbnet-0.1.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate dumbnet 0.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate dumbnet 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 dumbnet 0.1.0
[INFO] finished tweaking crates.io crate dumbnet 0.1.0
[INFO] tweaked toml for crates.io crate dumbnet 0.1.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate dumbnet 0.1.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded numeric-array v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] c141f3b6506672e25c858cd4acd113c3158b3bb2f33a13b100c29b7d746f737e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c141f3b6506672e25c858cd4acd113c3158b3bb2f33a13b100c29b7d746f737e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c141f3b6506672e25c858cd4acd113c3158b3bb2f33a13b100c29b7d746f737e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c141f3b6506672e25c858cd4acd113c3158b3bb2f33a13b100c29b7d746f737e", kill_on_drop: false }`
[INFO] [stdout] c141f3b6506672e25c858cd4acd113c3158b3bb2f33a13b100c29b7d746f737e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1ecef08fa4b79f61565b55c9c38a511a882b2595e6bf0e4c16a7055a1784ab85
[INFO] running `Command { std: "docker" "start" "-a" "1ecef08fa4b79f61565b55c9c38a511a882b2595e6bf0e4c16a7055a1784ab85", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling c2-chacha v0.2.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling generic-array v0.13.2
[INFO] [stderr]    Compiling numeric-array v0.4.2
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling dumbnet 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(trait_alias)]
[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 `dumbnet` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1ecef08fa4b79f61565b55c9c38a511a882b2595e6bf0e4c16a7055a1784ab85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ecef08fa4b79f61565b55c9c38a511a882b2595e6bf0e4c16a7055a1784ab85", kill_on_drop: false }`
[INFO] [stdout] 1ecef08fa4b79f61565b55c9c38a511a882b2595e6bf0e4c16a7055a1784ab85
