[INFO] fetching crate espa 0.3.2...
[INFO] documenting espa-0.3.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate espa 0.3.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate espa 0.3.2 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate espa 0.3.2
[INFO] finished tweaking crates.io crate espa 0.3.2
[INFO] tweaked toml for crates.io crate espa 0.3.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate espa 0.3.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded uuid v0.8.1
[INFO] [stderr]   Downloaded serde_yaml v0.8.13
[INFO] [stderr]   Downloaded enum-primitive-derive v0.2.1
[INFO] [stderr]   Downloaded yaml-rust v0.4.4
[INFO] [stderr]   Downloaded macro-attr v0.2.0
[INFO] [stderr]   Downloaded nameof v1.2.1
[INFO] [stderr]   Downloaded esl v0.4.2
[INFO] [stderr]   Downloaded enum_derive v0.1.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e17d8c25bde87390ebef660e2324f6eae55597e879760172bb8295b47b331d10
[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" "e17d8c25bde87390ebef660e2324f6eae55597e879760172bb8295b47b331d10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e17d8c25bde87390ebef660e2324f6eae55597e879760172bb8295b47b331d10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e17d8c25bde87390ebef660e2324f6eae55597e879760172bb8295b47b331d10", kill_on_drop: false }`
[INFO] [stdout] e17d8c25bde87390ebef660e2324f6eae55597e879760172bb8295b47b331d10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "RUSTDOCFLAGS=--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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--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] 77919fa99fd073c95eb2383043c36af9e49d68617201f106f1ad324b5f74a165
[INFO] running `Command { std: "docker" "start" "-a" "77919fa99fd073c95eb2383043c36af9e49d68617201f106f1ad324b5f74a165", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking enum_derive v0.1.7
[INFO] [stderr]     Checking macro-attr v0.2.0
[INFO] [stderr]     Checking nameof v1.2.1
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking flate2 v1.0.16
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]    Compiling enum-primitive-derive v0.2.1
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]     Checking nom v5.1.2
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking either v1.6.0
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]    Compiling esl v0.4.2
[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-0.4.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(ptr_offset_from)]
[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-0.4.2/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![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-0.4.2/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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" "77919fa99fd073c95eb2383043c36af9e49d68617201f106f1ad324b5f74a165", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77919fa99fd073c95eb2383043c36af9e49d68617201f106f1ad324b5f74a165", kill_on_drop: false }`
[INFO] [stdout] 77919fa99fd073c95eb2383043c36af9e49d68617201f106f1ad324b5f74a165