[INFO] fetching crate espa 0.5.0...
[INFO] testing espa-0.5.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate espa 0.5.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate espa 0.5.0 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 espa 0.5.0
[INFO] finished tweaking crates.io crate espa 0.5.0
[INFO] tweaked toml for crates.io crate espa 0.5.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate espa 0.5.0 already has a lockfile, it will not be regenerated
[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 nameof v1.2.1
[INFO] [stderr]   Downloaded macro-attr-2018 v1.0.0
[INFO] [stderr]   Downloaded enum-derive-2018 v1.0.1
[INFO] [stderr]   Downloaded esl v0.7.0
[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] 8b7a9a73cdf1313494ce190fa0ae8790dd550eb0ab90b941c09117af29ceeaa4
[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" "8b7a9a73cdf1313494ce190fa0ae8790dd550eb0ab90b941c09117af29ceeaa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b7a9a73cdf1313494ce190fa0ae8790dd550eb0ab90b941c09117af29ceeaa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b7a9a73cdf1313494ce190fa0ae8790dd550eb0ab90b941c09117af29ceeaa4", kill_on_drop: false }`
[INFO] [stdout] 8b7a9a73cdf1313494ce190fa0ae8790dd550eb0ab90b941c09117af29ceeaa4
[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] [stdout] 078a07b00a57c3ee5ef4e6db80ba92663dd27b93d71ad3cbe0f278bea1d13651
[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" "078a07b00a57c3ee5ef4e6db80ba92663dd27b93d71ad3cbe0f278bea1d13651", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling enum-derive-2018 v1.0.1
[INFO] [stderr]    Compiling macro-attr-2018 v1.0.0
[INFO] [stderr]    Compiling nameof v1.2.1
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]    Compiling flate2 v1.0.16
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling uuid v0.8.1
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling enum-ordinalize v3.1.8
[INFO] [stderr]    Compiling enum-primitive-derive v0.2.1
[INFO] [stderr]    Compiling educe v0.4.13
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling either v1.6.0
[INFO] [stderr]    Compiling serde_yaml v0.8.13
[INFO] [stderr]    Compiling esl v0.7.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/esl-0.7.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(type_alias_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/esl-0.7.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `esl`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "078a07b00a57c3ee5ef4e6db80ba92663dd27b93d71ad3cbe0f278bea1d13651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "078a07b00a57c3ee5ef4e6db80ba92663dd27b93d71ad3cbe0f278bea1d13651", kill_on_drop: false }`
[INFO] [stdout] 078a07b00a57c3ee5ef4e6db80ba92663dd27b93d71ad3cbe0f278bea1d13651