[INFO] updating cached repository https://github.com/zklapow/duplex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6590429dc4552c62fdba46c2ca0a811f835e4b92
[INFO] documenting zklapow/duplex against master#394e1b40d264aa6928811919c1124fa248e7d802 for pr-73566
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzklapow%2Fduplex" "/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/zklapow/duplex on toolchain 394e1b40d264aa6928811919c1124fa248e7d802
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zklapow/duplex
[INFO] finished tweaking git repo https://github.com/zklapow/duplex
[INFO] tweaked toml for git repo https://github.com/zklapow/duplex written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/zklapow/duplex already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c3a4d8b5b0ea27827bcb45b62c4a4220e88f19dcd3ffd3791dcd54b4a1000659
[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" "c3a4d8b5b0ea27827bcb45b62c4a4220e88f19dcd3ffd3791dcd54b4a1000659", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3a4d8b5b0ea27827bcb45b62c4a4220e88f19dcd3ffd3791dcd54b4a1000659", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3a4d8b5b0ea27827bcb45b62c4a4220e88f19dcd3ffd3791dcd54b4a1000659", kill_on_drop: false }`
[INFO] [stdout] c3a4d8b5b0ea27827bcb45b62c4a4220e88f19dcd3ffd3791dcd54b4a1000659
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 227a7a4dd287408150b65eec7511127d51bcd93cd6e48ea34b410a16e918ab76
[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" "227a7a4dd287408150b65eec7511127d51bcd93cd6e48ea34b410a16e918ab76", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.22
[INFO] [stderr]     Checking log v0.3.7
[INFO] [stderr]     Checking futures v0.1.13
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]     Checking num-traits v0.1.37
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking vec_map v0.7.0
[INFO] [stderr]     Checking unicode-segmentation v1.1.0
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking bitflags v0.8.2
[INFO] [stderr]     Checking iovec v0.1.0
[INFO] [stderr]     Checking thread-id v2.0.0
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]     Checking net2 v0.2.27
[INFO] [stderr]     Checking time v0.1.37
[INFO] [stderr]     Checking atty v0.2.2
[INFO] [stderr]     Checking term_size v0.3.0
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking thread_local v0.2.7
[INFO] [stderr]     Checking bytes v0.4.3
[INFO] [stderr]     Checking clap v2.23.3
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr]     Checking mio v0.6.7
[INFO] [stderr]     Checking num-integer v0.1.34
[INFO] [stderr]     Checking num-iter v0.1.33
[INFO] [stderr]     Checking regex v0.1.80
[INFO] [stderr]     Checking tokio-io v0.1.1
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking num v0.1.37
[INFO] [stderr]     Checking chrono v0.3.1
[INFO] [stderr]     Checking tokio-core v0.1.6
[INFO] [stderr]     Checking env_logger v0.3.5
[INFO] [stderr]     Checking tokio-proto v0.1.1
[INFO] [stderr]  Documenting duplex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.90s
[INFO] running `Command { std: "docker" "inspect" "227a7a4dd287408150b65eec7511127d51bcd93cd6e48ea34b410a16e918ab76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "227a7a4dd287408150b65eec7511127d51bcd93cd6e48ea34b410a16e918ab76", kill_on_drop: false }`
[INFO] [stdout] 227a7a4dd287408150b65eec7511127d51bcd93cd6e48ea34b410a16e918ab76