[INFO] cloning repository https://github.com/phaazon/tzstats-middleware
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/phaazon/tzstats-middleware" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphaazon%2Ftzstats-middleware", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphaazon%2Ftzstats-middleware'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9ddfa80bb58cf6571afcd64f9c15756233b2e6f9
[INFO] documenting phaazon/tzstats-middleware against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphaazon%2Ftzstats-middleware" "/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/phaazon/tzstats-middleware on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/phaazon/tzstats-middleware
[INFO] finished tweaking git repo https://github.com/phaazon/tzstats-middleware
[INFO] tweaked toml for git repo https://github.com/phaazon/tzstats-middleware written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/phaazon/tzstats-middleware already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro-error v1.0.3
[INFO] [stderr]   Downloaded proc-macro-error-attr v1.0.3
[INFO] [stderr]   Downloaded structopt-derive v0.4.8
[INFO] [stderr]   Downloaded headers v0.3.1
[INFO] [stderr]   Downloaded structopt v0.3.15
[INFO] [stderr]   Downloaded openssl-src v111.6.1+1.1.1d
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 41f220d6b78f6334191dc51f858cf3612e76f729d7e84b6f4cc471720700a48f
[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" "41f220d6b78f6334191dc51f858cf3612e76f729d7e84b6f4cc471720700a48f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41f220d6b78f6334191dc51f858cf3612e76f729d7e84b6f4cc471720700a48f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41f220d6b78f6334191dc51f858cf3612e76f729d7e84b6f4cc471720700a48f", kill_on_drop: false }`
[INFO] [stdout] 41f220d6b78f6334191dc51f858cf3612e76f729d7e84b6f4cc471720700a48f
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6b5fe1c177ab36396966b1ccc7fb2303e471d71c670f1d71eedd11283e763cfd
[INFO] running `Command { std: "docker" "start" "-a" "6b5fe1c177ab36396966b1ccc7fb2303e471d71c670f1d71eedd11283e763cfd", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.67
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[INFO] [stderr]    Compiling syn v1.0.16
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[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
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[INFO] [stderr]    Compiling serde v1.0.104
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[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking headers v0.3.1
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling mime_guess v1.8.8
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[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking tokio v0.2.13
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking structopt v0.3.15
[INFO] [stderr]     Checking h2 v0.2.2
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking tokio-tungstenite v0.10.1
[INFO] [stderr]     Checking hyper v0.13.3
[INFO] [stderr]     Checking warp v0.2.2
[INFO] [stderr]     Checking tokio-tls v0.3.0
[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]     Checking reqwest v0.10.4
[INFO] [stderr]  Documenting tzstats-middleware v0.1.1 (/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 `tzstats-middleware`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name tzstats_middleware src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=251028edd686c6c4 -L dependency=/opt/rustwide/target/debug/deps --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-682ee23264ad1d9f.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-93b161ccc946a4b6.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-a56c0a856f5bcb99.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-1dbf4bd349818313.rmeta --extern warp=/opt/rustwide/target/debug/deps/libwarp-b5051bf073724b71.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6b5fe1c177ab36396966b1ccc7fb2303e471d71c670f1d71eedd11283e763cfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b5fe1c177ab36396966b1ccc7fb2303e471d71c670f1d71eedd11283e763cfd", kill_on_drop: false }`
[INFO] [stdout] 6b5fe1c177ab36396966b1ccc7fb2303e471d71c670f1d71eedd11283e763cfd