[INFO] fetching crate rustube 0.3.5...
[INFO] documenting rustube-0.3.5 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate rustube 0.3.5 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rustube 0.3.5 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 rustube 0.3.5
[INFO] finished tweaking crates.io crate rustube 0.3.5
[INFO] tweaked toml for crates.io crate rustube 0.3.5 written to /workspace/builds/worker-4/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e2719713421dac806ea009cf1dea7bc2389fbc4cb057cf4a34e24503999cfb10
[INFO] running `Command { std: "docker" "start" "-a" "e2719713421dac806ea009cf1dea7bc2389fbc4cb057cf4a34e24503999cfb10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e2719713421dac806ea009cf1dea7bc2389fbc4cb057cf4a34e24503999cfb10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2719713421dac806ea009cf1dea7bc2389fbc4cb057cf4a34e24503999cfb10", kill_on_drop: false }`
[INFO] [stdout] e2719713421dac806ea009cf1dea7bc2389fbc4cb057cf4a34e24503999cfb10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 33890ac91d9b0d4bb8c60f9d46d7c4a266802e3167cc9f4ea8abc0e3d020e820
[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" "33890ac91d9b0d4bb8c60f9d46d7c4a266802e3167cc9f4ea8abc0e3d020e820", 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]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling cookie v0.14.4
[INFO] [stderr]    Compiling darling_core v0.13.0
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]     Checking tokio v1.9.0
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling darling_macro v0.13.0
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking serde_json v1.0.66
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking serde_qs v0.8.4
[INFO] [stderr]     Checking tokio-util v0.6.7
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking async-compression v0.3.8
[INFO] [stderr]     Checking tokio-stream v0.1.7
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling log-derive v0.4.1
[INFO] [stderr]     Checking h2 v0.3.3
[INFO] [stderr]     Checking publicsuffix v1.5.6
[INFO] [stderr]    Compiling darling v0.13.0
[INFO] [stderr]     Checking cookie_store v0.12.0
[INFO] [stderr]    Compiling serde_with_macros v1.4.2
[INFO] [stderr]     Checking hyper v0.14.11
[INFO] [stderr]     Checking serde_with v1.9.4
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.4
[INFO] [stderr]  Documenting rustube v0.3.5 (/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(
[INFO] [stdout] 2 | | doc_cfg,
[INFO] [stdout] 3 | | async_closure, bool_to_option, cow_is_borrowed, once_cell, box_syntax,
[INFO] [stdout] 4 | | str_split_as_str, option_result_contains
[INFO] [stdout] 5 | | )]
[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 `rustube`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name rustube src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="bytes"' --cfg 'feature="chrono"' --cfg 'feature="default"' --cfg 'feature="default-tls"' --cfg 'feature="descramble"' --cfg 'feature="download"' --cfg 'feature="fetch"' --cfg 'feature="mime"' --cfg 'feature="regex"' --cfg 'feature="reqwest"' --cfg 'feature="serde_json"' --cfg 'feature="serde_qs"' --cfg 'feature="serde_with"' --cfg 'feature="std"' --cfg 'feature="stream"' --cfg 'feature="thiserror"' --cfg 'feature="tokio"' --cfg 'feature="tokio-stream"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-7b9084f8ae89ce82.rmeta --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-810dd9fbe1e28608.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-f04761d253441e64.rmeta --extern derivative=/opt/rustwide/target/debug/deps/libderivative-46ce07ef15070539.so --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-7f51f1d1f2b1f18a.so --extern log=/opt/rustwide/target/debug/deps/liblog-f8abb66ffc16068c.rmeta --extern log_derive=/opt/rustwide/target/debug/deps/liblog_derive-7979a49a39190a4f.so --extern mime=/opt/rustwide/target/debug/deps/libmime-21774ff537d36263.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-46bf5b535d6b6b09.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-2c51c73da921f2a2.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-1baf2277de1b4c70.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-87271b603ef45419.rmeta --extern serde_qs=/opt/rustwide/target/debug/deps/libserde_qs-2ee15cf229159047.rmeta --extern serde_with=/opt/rustwide/target/debug/deps/libserde_with-866cedb832a3a134.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-e6f46b178d972a75.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-8a866b423f0e065e.rmeta --extern tokio_stream=/opt/rustwide/target/debug/deps/libtokio_stream-d69ea5d07ce30e54.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-af8f6feafc1f59e2.rmeta --cap-lints=warn --crate-version 0.3.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "33890ac91d9b0d4bb8c60f9d46d7c4a266802e3167cc9f4ea8abc0e3d020e820", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33890ac91d9b0d4bb8c60f9d46d7c4a266802e3167cc9f4ea8abc0e3d020e820", kill_on_drop: false }`
[INFO] [stdout] 33890ac91d9b0d4bb8c60f9d46d7c4a266802e3167cc9f4ea8abc0e3d020e820
