[INFO] fetching crate mdbook_rash 1.0.0...
[INFO] documenting mdbook_rash-1.0.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate mdbook_rash 1.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate mdbook_rash 1.0.0 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 crates.io crate mdbook_rash 1.0.0
[INFO] finished tweaking crates.io crate mdbook_rash 1.0.0
[INFO] tweaked toml for crates.io crate mdbook_rash 1.0.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate mdbook_rash 1.0.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded toml-query_derive v0.9.2
[INFO] [stderr]   Downloaded mdbook v0.3.7
[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" "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] a3bb256dfa99517e4fbd028d6fa0776a725145f00c049e2e8a1de60d4682cbc1
[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" "a3bb256dfa99517e4fbd028d6fa0776a725145f00c049e2e8a1de60d4682cbc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3bb256dfa99517e4fbd028d6fa0776a725145f00c049e2e8a1de60d4682cbc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3bb256dfa99517e4fbd028d6fa0776a725145f00c049e2e8a1de60d4682cbc1", kill_on_drop: false }`
[INFO] [stdout] a3bb256dfa99517e4fbd028d6fa0776a725145f00c049e2e8a1de60d4682cbc1
[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" "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] [stdout] f672e4fbe31eea943c9535c3b810755c525aeb71bcdc7b84fa7cabba1bc98de8
[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" "f672e4fbe31eea943c9535c3b810755c525aeb71bcdc7b84fa7cabba1bc98de8", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]     Checking is-match v0.1.0
[INFO] [stderr]     Checking open v1.4.0
[INFO] [stderr]     Checking backtrace v0.3.48
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking serde_json v1.0.55
[INFO] [stderr]     Checking pulldown-cmark v0.6.1
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling darling_core v0.8.6
[INFO] [stderr]     Checking error-chain v0.12.2
[INFO] [stderr]    Compiling darling_macro v0.8.6
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling darling v0.8.6
[INFO] [stderr]    Compiling toml-query_derive v0.9.2
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking handlebars v3.1.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking toml-query v0.9.2
[INFO] [stderr]     Checking mdbook v0.3.7
[INFO] [stderr]  Documenting mdbook_rash v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 01s
[INFO] running `Command { std: "docker" "inspect" "f672e4fbe31eea943c9535c3b810755c525aeb71bcdc7b84fa7cabba1bc98de8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f672e4fbe31eea943c9535c3b810755c525aeb71bcdc7b84fa7cabba1bc98de8", kill_on_drop: false }`
[INFO] [stdout] f672e4fbe31eea943c9535c3b810755c525aeb71bcdc7b84fa7cabba1bc98de8