[INFO] fetching crate intercom-common 0.3.0...
[INFO] documenting intercom-common-0.3.0 against beta-2020-10-09 for beta-1.48-rustdoc-1
[INFO] extracting crate intercom-common 0.3.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate intercom-common 0.3.0 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate intercom-common 0.3.0
[INFO] finished tweaking crates.io crate intercom-common 0.3.0
[INFO] tweaked toml for crates.io crate intercom-common 0.3.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 232e0395841eef0ad212f8bfc11f3b66153b686f6c7a60a23d3f011c5ed4bbfb
[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" "232e0395841eef0ad212f8bfc11f3b66153b686f6c7a60a23d3f011c5ed4bbfb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "232e0395841eef0ad212f8bfc11f3b66153b686f6c7a60a23d3f011c5ed4bbfb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "232e0395841eef0ad212f8bfc11f3b66153b686f6c7a60a23d3f011c5ed4bbfb", kill_on_drop: false }`
[INFO] [stdout] 232e0395841eef0ad212f8bfc11f3b66153b686f6c7a60a23d3f011c5ed4bbfb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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-2020-10-09" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 72fb04ba89e34928d64cf42a72d90e4649f363152010215c27005afe3de67437
[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" "72fb04ba89e34928d64cf42a72d90e4649f363152010215c27005afe3de67437", kill_on_drop: false }`
[INFO] [stderr]     Checking pest v0.3.3
[INFO] [stderr]     Checking sha1 v0.3.0
[INFO] [stderr]     Checking handlebars v0.29.1
[INFO] [stderr]  Documenting intercom-common v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(non_exhaustive)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[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 document `intercom-common`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name intercom_common src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern failure=/opt/rustwide/target/debug/deps/libfailure-93a8d14db5bfdc2a.rmeta --extern handlebars=/opt/rustwide/target/debug/deps/libhandlebars-0c9ab77dc133863e.rmeta --extern ordermap=/opt/rustwide/target/debug/deps/libordermap-0cae4007599e077f.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-e2b55f3fa9b89984.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-252ac74022158045.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-206cfb4b5fe90396.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-3912a75c17f0c7d5.so --extern sha1=/opt/rustwide/target/debug/deps/libsha1-1212c71c9f3b6f8a.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-fdd13fd9bb29b5a4.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-0d8137c182fc2426.rmeta --cap-lints=warn --crate-version 0.3.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "72fb04ba89e34928d64cf42a72d90e4649f363152010215c27005afe3de67437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72fb04ba89e34928d64cf42a72d90e4649f363152010215c27005afe3de67437", kill_on_drop: false }`
[INFO] [stdout] 72fb04ba89e34928d64cf42a72d90e4649f363152010215c27005afe3de67437
