[INFO] fetching crate mk20d7 0.1.1...
[INFO] documenting mk20d7-0.1.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate mk20d7 0.1.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate mk20d7 0.1.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mk20d7 0.1.1
[INFO] finished tweaking crates.io crate mk20d7 0.1.1
[INFO] tweaked toml for crates.io crate mk20d7 0.1.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 127a0ec89d73ace260c52c2cf0ffcf34c7bc5fab9c77caaf7a1e520454cda54a
[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" "127a0ec89d73ace260c52c2cf0ffcf34c7bc5fab9c77caaf7a1e520454cda54a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "127a0ec89d73ace260c52c2cf0ffcf34c7bc5fab9c77caaf7a1e520454cda54a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "127a0ec89d73ace260c52c2cf0ffcf34c7bc5fab9c77caaf7a1e520454cda54a", kill_on_drop: false }`
[INFO] [stdout] 127a0ec89d73ace260c52c2cf0ffcf34c7bc5fab9c77caaf7a1e520454cda54a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e048227c2e769681f8e72d39d108866fa13e32fb1f10952568893052f56f8399
[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" "e048227c2e769681f8e72d39d108866fa13e32fb1f10952568893052f56f8399", kill_on_drop: false }`
[INFO] [stderr]    Compiling mk20d7 v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]    Compiling cortex-m v0.7.3
[INFO] [stderr]    Compiling cortex-m v0.5.11
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking as-slice v0.1.5
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]     Checking embedded-hal v0.2.6
[INFO] [stderr]     Checking aligned v0.3.5
[INFO] [stderr]  Documenting mk20d7 v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lint `private_no_mangle_statics` has been removed: no longer a warning, `#[no_mangle]` statics always exported
[INFO] [stdout]     --> src/lib.rs:1709:9
[INFO] [stdout]      |
[INFO] [stdout] 1709 | #[allow(private_no_mangle_statics)]
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]     --> src/lib.rs:3:9
[INFO] [stdout]      |
[INFO] [stdout] 3    | #![deny(warnings)]
[INFO] [stdout]      |         ^^^^^^^^
[INFO] [stdout]      = note: `#[warn(renamed_and_removed_lints)]` implied by `#[warn(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `mk20d7`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name mk20d7 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 bare_metal=/opt/rustwide/target/debug/deps/libbare_metal-db87dda843f09e14.rmeta --extern cortex_m=/opt/rustwide/target/debug/deps/libcortex_m-cf1d86bf8fc54217.rmeta --extern vcell=/opt/rustwide/target/debug/deps/libvcell-7026868ef2666f61.rmeta --cap-lints=warn --crate-version 0.1.1` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "e048227c2e769681f8e72d39d108866fa13e32fb1f10952568893052f56f8399", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e048227c2e769681f8e72d39d108866fa13e32fb1f10952568893052f56f8399", kill_on_drop: false }`
[INFO] [stdout] e048227c2e769681f8e72d39d108866fa13e32fb1f10952568893052f56f8399