[INFO] fetching crate enumx 0.4.1...
[INFO] testing enumx-0.4.1 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate enumx 0.4.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate enumx 0.4.1 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate enumx 0.4.1
[INFO] finished tweaking crates.io crate enumx 0.4.1
[INFO] tweaked toml for crates.io crate enumx 0.4.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded enumx_derive v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2dad8ad9f7ebd8faca7f9c0b895d80c1debe858ee8a33ad54386552daa1e6ca8
[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" "2dad8ad9f7ebd8faca7f9c0b895d80c1debe858ee8a33ad54386552daa1e6ca8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2dad8ad9f7ebd8faca7f9c0b895d80c1debe858ee8a33ad54386552daa1e6ca8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2dad8ad9f7ebd8faca7f9c0b895d80c1debe858ee8a33ad54386552daa1e6ca8", kill_on_drop: false }`
[INFO] [stdout] 2dad8ad9f7ebd8faca7f9c0b895d80c1debe858ee8a33ad54386552daa1e6ca8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 153258782c98c168252e0200efb88b5744ae402ef3f97a788d4d4f31ee34d431
[INFO] running `Command { std: "docker" "start" "-a" "153258782c98c168252e0200efb88b5744ae402ef3f97a788d4d4f31ee34d431", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling enumx_derive v0.4.0
[INFO] [stderr]    Compiling enumx v0.4.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.29s
[INFO] running `Command { std: "docker" "inspect" "153258782c98c168252e0200efb88b5744ae402ef3f97a788d4d4f31ee34d431", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "153258782c98c168252e0200efb88b5744ae402ef3f97a788d4d4f31ee34d431", kill_on_drop: false }`
[INFO] [stdout] 153258782c98c168252e0200efb88b5744ae402ef3f97a788d4d4f31ee34d431
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87548476456d9862663d726c38fba6e4633fa15171969fc124f450263ef6effc
[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" "87548476456d9862663d726c38fba6e4633fa15171969fc124f450263ef6effc", kill_on_drop: false }`
[INFO] [stderr]    Compiling enumx v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> tests/macro_inheritance.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 |   #![cfg_attr( test, feature(
[INFO] [stdout]   |  ____________________^
[INFO] [stdout] 2 | |     fn_traits,
[INFO] [stdout] 3 | |     generator_trait,
[INFO] [stdout] 4 | |     generators,
[INFO] [stdout] ... |
[INFO] [stdout] 8 | |     unboxed_closures,
[INFO] [stdout] 9 | | ))]
[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 `enumx`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> tests/syntax.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 |   #![cfg_attr( test, feature(
[INFO] [stdout]   |  ____________________^
[INFO] [stdout] 2 | |     fn_traits,
[INFO] [stdout] 3 | |     generator_trait,
[INFO] [stdout] 4 | |     generators,
[INFO] [stdout] ... |
[INFO] [stdout] 8 | |     unboxed_closures,
[INFO] [stdout] 9 | | ))]
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "87548476456d9862663d726c38fba6e4633fa15171969fc124f450263ef6effc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87548476456d9862663d726c38fba6e4633fa15171969fc124f450263ef6effc", kill_on_drop: false }`
[INFO] [stdout] 87548476456d9862663d726c38fba6e4633fa15171969fc124f450263ef6effc