[INFO] cloning repository https://github.com/maybevoid/ferrite
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/maybevoid/ferrite" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaybevoid%2Fferrite", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaybevoid%2Fferrite'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 731da255cd15234a38ceb3dcee8e75997fa54742
[INFO] documenting maybevoid/ferrite 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%2Fmaybevoid%2Fferrite" "/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/maybevoid/ferrite 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/maybevoid/ferrite
[INFO] finished tweaking git repo https://github.com/maybevoid/ferrite
[INFO] tweaked toml for git repo https://github.com/maybevoid/ferrite written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/maybevoid/ferrite 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] 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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0484157bc085ccf997c5d7d45bd59fe3aee46d13db8a4de608fed884c9367a00
[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" "0484157bc085ccf997c5d7d45bd59fe3aee46d13db8a4de608fed884c9367a00", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0484157bc085ccf997c5d7d45bd59fe3aee46d13db8a4de608fed884c9367a00", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0484157bc085ccf997c5d7d45bd59fe3aee46d13db8a4de608fed884c9367a00", kill_on_drop: false }`
[INFO] [stdout] 0484157bc085ccf997c5d7d45bd59fe3aee46d13db8a4de608fed884c9367a00
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 097e46bc7390ca2332eef6ecfc6fb9a9795fd3d3ad33976595a0a3f60a205bdf
[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" "097e46bc7390ca2332eef6ecfc6fb9a9795fd3d3ad33976595a0a3f60a205bdf", 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] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.67
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]    Compiling wasm-bindgen v0.2.67
[INFO] [stderr]     Checking fastrand v1.3.5
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]     Checking event-listener v2.4.0
[INFO] [stderr]     Checking vec-arena v0.5.2
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking send_wrapper v0.4.0
[INFO] [stderr]     Checking parking v1.0.6
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking async-macros v2.0.0
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking async-mutex v1.2.0
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking multitask v0.2.0
[INFO] [stderr]     Checking async-channel v1.4.1
[INFO] [stderr]     Checking polling v0.1.7
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking simple_logger v1.7.0
[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]    Compiling wasm-bindgen-backend v0.2.67
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.67
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.67
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking js-sys v0.3.44
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking web-sys v0.3.44
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking gloo-timers v0.2.1
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking async-std v1.6.3
[INFO] [stderr]     Checking ferrite v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting ferrite v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_std::task`
[INFO] [stdout]  --> src/session/choice2/external_choice_offer.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use async_std::task;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_macros::join`
[INFO] [stdout]  --> src/session/choice2/external_choice_offer.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use async_macros::join;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Receiver`, `channel`
[INFO] [stdout]  --> src/session/choice2/external_choice_offer.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use async_std::sync::{ Receiver, channel };
[INFO] [stdout]   |                        ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.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 `ferrite`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name ferrite 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 async_macros=/opt/rustwide/target/debug/deps/libasync_macros-d382730c7f0940a2.rmeta --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-7cc6eb6530e7b17a.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-ad89badb0221dfda.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-6921beed5633799a.rmeta --extern futures_macro=/opt/rustwide/target/debug/deps/libfutures_macro-571984bc93ff1e78.so --extern log=/opt/rustwide/target/debug/deps/liblog-bb6d8bd8fe04b0f6.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-9de4bdcd0d606d7b.rmeta --extern simple_logger=/opt/rustwide/target/debug/deps/libsimple_logger-44a373391213d7d2.rmeta --cap-lints=warn` (exit code: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "097e46bc7390ca2332eef6ecfc6fb9a9795fd3d3ad33976595a0a3f60a205bdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "097e46bc7390ca2332eef6ecfc6fb9a9795fd3d3ad33976595a0a3f60a205bdf", kill_on_drop: false }`
[INFO] [stdout] 097e46bc7390ca2332eef6ecfc6fb9a9795fd3d3ad33976595a0a3f60a205bdf