[INFO] cloning repository https://github.com/boardwalk/oneshot_crash
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/boardwalk/oneshot_crash" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fboardwalk%2Foneshot_crash", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fboardwalk%2Foneshot_crash'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 403aebd8c914d080d82b85265e98ca5bd9c409df
[INFO] documenting boardwalk/oneshot_crash against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fboardwalk%2Foneshot_crash" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/boardwalk/oneshot_crash on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/boardwalk/oneshot_crash
[INFO] finished tweaking git repo https://github.com/boardwalk/oneshot_crash
[INFO] tweaked toml for git repo https://github.com/boardwalk/oneshot_crash written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/boardwalk/oneshot_crash already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ce29c03b4fc027f5bcd92cdfda6f71987f128023fed6c6de39193da0dbed3f2
[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" "8ce29c03b4fc027f5bcd92cdfda6f71987f128023fed6c6de39193da0dbed3f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ce29c03b4fc027f5bcd92cdfda6f71987f128023fed6c6de39193da0dbed3f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ce29c03b4fc027f5bcd92cdfda6f71987f128023fed6c6de39193da0dbed3f2", kill_on_drop: false }`
[INFO] [stdout] 8ce29c03b4fc027f5bcd92cdfda6f71987f128023fed6c6de39193da0dbed3f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5cbb1dd26384d4f6760f0bd26266722209c74683302999ed435d8350fb92ea2d
[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" "5cbb1dd26384d4f6760f0bd26266722209c74683302999ed435d8350fb92ea2d", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-micro v0.2.0
[INFO] [stderr]     Checking easy-parallel v3.1.0
[INFO] [stderr]     Checking async-channel v1.4.0
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking polling v0.1.5
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking async-oneshot v0.3.1
[INFO] [stderr]     Checking async-io v0.1.11
[INFO] [stderr]     Checking blocking v0.5.2
[INFO] [stderr]     Checking async-executor v0.1.2
[INFO] [stderr]     Checking smol v0.3.3
[INFO] [stderr]  Documenting oneshot_crash v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable 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 `oneshot_crash`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name oneshot_crash 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-43a48fd651ba2367.rmeta --extern async_oneshot=/opt/rustwide/target/debug/deps/libasync_oneshot-6e84075258ff6c16.rmeta --extern futures_util=/opt/rustwide/target/debug/deps/libfutures_util-8db122ebc75c704a.rmeta --extern smol=/opt/rustwide/target/debug/deps/libsmol-2d4581e679de8d9d.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "5cbb1dd26384d4f6760f0bd26266722209c74683302999ed435d8350fb92ea2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5cbb1dd26384d4f6760f0bd26266722209c74683302999ed435d8350fb92ea2d", kill_on_drop: false }`
[INFO] [stdout] 5cbb1dd26384d4f6760f0bd26266722209c74683302999ed435d8350fb92ea2d