[INFO] cloning repository https://github.com/youhavethewrong/lg
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/youhavethewrong/lg" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyouhavethewrong%2Flg", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyouhavethewrong%2Flg'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 610dab7c0977779f905db0f4ef34b9299892e8a7
[INFO] documenting youhavethewrong/lg against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyouhavethewrong%2Flg" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/youhavethewrong/lg 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 git repo https://github.com/youhavethewrong/lg
[INFO] finished tweaking git repo https://github.com/youhavethewrong/lg
[INFO] tweaked toml for git repo https://github.com/youhavethewrong/lg written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/youhavethewrong/lg 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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 929266d4b9e72fa40968d4d661a49222363aef66f3c95f995fd8fdb4a89d9dc5
[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" "929266d4b9e72fa40968d4d661a49222363aef66f3c95f995fd8fdb4a89d9dc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "929266d4b9e72fa40968d4d661a49222363aef66f3c95f995fd8fdb4a89d9dc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "929266d4b9e72fa40968d4d661a49222363aef66f3c95f995fd8fdb4a89d9dc5", kill_on_drop: false }`
[INFO] [stdout] 929266d4b9e72fa40968d4d661a49222363aef66f3c95f995fd8fdb4a89d9dc5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] ce67368c1df0d68c6e16fe559ba2a97da4aa8c960bdeb969f6269c764ba72bcb
[INFO] running `Command { std: "docker" "start" "-a" "ce67368c1df0d68c6e16fe559ba2a97da4aa8c960bdeb969f6269c764ba72bcb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking termion v1.5.5
[INFO] [stderr]     Checking openssl-sys v0.9.54
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking openssl v0.10.28
[INFO] [stderr]     Checking tui v0.8.0
[INFO] [stderr]     Checking native-tls v0.2.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling tokio-macros v0.2.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking tokio v0.2.11
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tokio-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.2.1
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking hyper v0.13.2
[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]  Documenting lg v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[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 `lg`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name lg src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-b0e310172ffee45b.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-a45bb635f323d078.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-ccafe0e6cf8c1b67.rmeta --extern hyper_tls=/opt/rustwide/target/debug/deps/libhyper_tls-d5a101847a1a3dd1.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-92e6041116e22f27.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-1ff122cfc3b571f0.so --extern termion=/opt/rustwide/target/debug/deps/libtermion-54bb5c450a418308.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-4212b43cee822821.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-6c90053f35556a40.rmeta --extern tui=/opt/rustwide/target/debug/deps/libtui-ac5301d343d8c767.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ce67368c1df0d68c6e16fe559ba2a97da4aa8c960bdeb969f6269c764ba72bcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce67368c1df0d68c6e16fe559ba2a97da4aa8c960bdeb969f6269c764ba72bcb", kill_on_drop: false }`
[INFO] [stdout] ce67368c1df0d68c6e16fe559ba2a97da4aa8c960bdeb969f6269c764ba72bcb