[INFO] cloning repository https://github.com/Igosuki/signalr-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Igosuki/signalr-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIgosuki%2Fsignalr-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIgosuki%2Fsignalr-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0fca71a14d013c2ec92d9789c6d2e3e1a366c45e
[INFO] documenting Igosuki/signalr-rs 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%2FIgosuki%2Fsignalr-rs" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Igosuki/signalr-rs 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/Igosuki/signalr-rs
[INFO] removed 1 missing examples
[INFO] finished tweaking git repo https://github.com/Igosuki/signalr-rs
[INFO] tweaked toml for git repo https://github.com/Igosuki/signalr-rs written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/Igosuki/signalr-rs 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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dee693015a8c2b375ee074ee3e528e98d6748f4f4faf1664e066e6bf3a1e507b
[INFO] running `Command { std: "docker" "start" "-a" "dee693015a8c2b375ee074ee3e528e98d6748f4f4faf1664e066e6bf3a1e507b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dee693015a8c2b375ee074ee3e528e98d6748f4f4faf1664e066e6bf3a1e507b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dee693015a8c2b375ee074ee3e528e98d6748f4f4faf1664e066e6bf3a1e507b", kill_on_drop: false }`
[INFO] [stdout] dee693015a8c2b375ee074ee3e528e98d6748f4f4faf1664e066e6bf3a1e507b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] b2f782e2f9aff9ee4996d329c162b6243bd473a1217da6a6b12d4afb624a2b9e
[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" "b2f782e2f9aff9ee4996d329c162b6243bd473a1217da6a6b12d4afb624a2b9e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.7
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]     Checking arc-swap v0.4.4
[INFO] [stderr]     Checking futures-io v0.3.1
[INFO] [stderr]     Checking pin-project-lite v0.1.2
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking rle-decode-fast v1.0.1
[INFO] [stderr]     Checking futures-channel v0.3.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]     Checking thread_local v1.0.0
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]     Checking bytestring v0.1.2
[INFO] [stderr]    Compiling openssl-sys v0.9.53
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]     Checking miniz_oxide v0.3.5
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking socket2 v0.3.11
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking libflate v0.1.27
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking regex v1.3.3
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking resolv-conf v0.6.2
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]     Checking crossbeam-channel v0.4.0
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]     Checking url v2.1.0
[INFO] [stderr]    Compiling openssl v0.10.26
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking tokio v0.2.9
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking backoff v0.1.5
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tokio-openssl v0.4.0
[INFO] [stderr]     Checking actix-codec v0.2.0
[INFO] [stderr]     Checking brotli2 v0.3.2
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling pin-project-internal v0.4.6
[INFO] [stderr]    Compiling derive_more v0.99.2
[INFO] [stderr]    Compiling actix-macros v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling enum-as-inner v0.3.0
[INFO] [stderr]    Compiling async-trait v0.1.22
[INFO] [stderr]    Compiling actix_derive v0.5.0
[INFO] [stderr]    Compiling actix-web-codegen v0.2.0
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]     Checking pin-project v0.4.6
[INFO] [stderr]     Checking actix-threadpool v0.3.1
[INFO] [stderr]     Checking futures-executor v0.3.1
[INFO] [stderr]     Checking actix-service v1.0.2
[INFO] [stderr]     Checking h2 v0.2.1
[INFO] [stderr]     Checking futures v0.3.1
[INFO] [stderr]     Checking actix-rt v1.0.0
[INFO] [stderr]     Checking trust-dns-proto v0.18.0-alpha.2
[INFO] [stderr]     Checking actix-utils v1.0.6
[INFO] [stderr]     Checking actix-tls v1.0.0
[INFO] [stderr]     Checking actix-server v1.0.1
[INFO] [stderr]     Checking actix-testing v1.0.0
[INFO] [stderr]     Checking trust-dns-resolver v0.18.0-alpha.2
[INFO] [stderr]     Checking actix-connect v1.0.1
[INFO] [stderr]     Checking serde_json v1.0.44
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking actix-router v0.2.4
[INFO] [stderr]     Checking actix-http v1.0.1
[INFO] [stderr]     Checking awc v1.0.1
[INFO] [stderr]     Checking actix v0.9.0
[INFO] [stderr]     Checking actix-web v2.0.0
[INFO] [stderr]  Documenting signalr_rs v0.1.3 (/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(try_trait)]
[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 `signalr_rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name signalr_rs 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 actix=/opt/rustwide/target/debug/deps/libactix-4900a79eca70a998.rmeta --extern actix_codec=/opt/rustwide/target/debug/deps/libactix_codec-6df872af4b7557fd.rmeta --extern actix_http=/opt/rustwide/target/debug/deps/libactix_http-937e747b98fac2c4.rmeta --extern actix_web=/opt/rustwide/target/debug/deps/libactix_web-05412deaec086380.rmeta --extern awc=/opt/rustwide/target/debug/deps/libawc-0d877273f2ff32af.rmeta --extern backoff=/opt/rustwide/target/debug/deps/libbackoff-b4c83617ea77f388.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-2cf622753e1ddd46.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-94f76de86987d6bc.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-7c27365ce7ad52c7.so --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-e9643a6b1ebf81f9.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-5437fea7acfc537b.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-965697ba8b50a905.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-57a7edc7f441d44c.rmeta --extern libflate=/opt/rustwide/target/debug/deps/liblibflate-6641522da28812bf.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-f96ba0118540bef9.rmeta --extern openssl=/opt/rustwide/target/debug/deps/libopenssl-75acb3facd4f9474.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-0a7b9fe22449405e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-393cc201cf7c7582.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-072dd9800b80952e.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-79b74c4cdab4862e.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-ce3fd8b760a7c3eb.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "b2f782e2f9aff9ee4996d329c162b6243bd473a1217da6a6b12d4afb624a2b9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2f782e2f9aff9ee4996d329c162b6243bd473a1217da6a6b12d4afb624a2b9e", kill_on_drop: false }`
[INFO] [stdout] b2f782e2f9aff9ee4996d329c162b6243bd473a1217da6a6b12d4afb624a2b9e