[INFO] cloning repository https://github.com/iovxw/rssbot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iovxw/rssbot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Frssbot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Frssbot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b68d4e6672da2ede5386ced343a1a7e3a35f66c
[INFO] documenting iovxw/rssbot against 1.47.0 for beta-1.48-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Frssbot" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iovxw/rssbot on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iovxw/rssbot
[INFO] finished tweaking git repo https://github.com/iovxw/rssbot
[INFO] tweaked toml for git repo https://github.com/iovxw/rssbot written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/iovxw/rssbot already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bcb812fea882f47d8c2531f3be1cf25735c38b277ca089aa461568bf7a3ef5d0
[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" "bcb812fea882f47d8c2531f3be1cf25735c38b277ca089aa461568bf7a3ef5d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bcb812fea882f47d8c2531f3be1cf25735c38b277ca089aa461568bf7a3ef5d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bcb812fea882f47d8c2531f3be1cf25735c38b277ca089aa461568bf7a3ef5d0", kill_on_drop: false }`
[INFO] [stdout] bcb812fea882f47d8c2531f3be1cf25735c38b277ca089aa461568bf7a3ef5d0
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0851aa96f8a4a4e28b99fbc1250a6ec35d09dd816db7f7f583215dd9d5c38e6
[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" "d0851aa96f8a4a4e28b99fbc1250a6ec35d09dd816db7f7f583215dd9d5c38e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling pinyin v0.8.0
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling ring v0.16.11
[INFO] [stderr]     Checking tracing-core v0.1.10
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking quick-xml v0.19.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking flate2 v1.0.14
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking async-compression v0.3.1
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking typed-headers v0.2.0
[INFO] [stderr]     Checking sct v0.6.0
[INFO] [stderr]     Checking webpki v0.21.2
[INFO] [stderr]     Checking ct-logs v0.6.0
[INFO] [stderr]     Checking rustls v0.16.0
[INFO] [stderr]     Checking rustls v0.18.0
[INFO] [stderr]     Checking webpki-roots v0.19.0
[INFO] [stderr]     Checking rustls-native-certs v0.1.0
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pmutil v0.5.3
[INFO] [stderr]    Compiling pin-project-internal v0.4.26
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]    Compiling futures-macro v0.3.6
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling tracing-attributes v0.1.7
[INFO] [stderr]    Compiling paste-impl v0.1.11
[INFO] [stderr]    Compiling thiserror-impl v1.0.21
[INFO] [stderr]    Compiling is-macro v0.1.8
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]     Checking paste v0.1.11
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]    Compiling structopt-derive v0.4.12
[INFO] [stderr]     Checking tracing v0.1.13
[INFO] [stderr]     Checking thiserror v1.0.21
[INFO] [stderr]     Checking pin-project v0.4.26
[INFO] [stderr]     Checking futures-util v0.3.6
[INFO] [stderr]     Checking tracing-futures v0.2.3
[INFO] [stderr]     Checking structopt v0.3.19
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tokio-rustls v0.12.2
[INFO] [stderr]     Checking tokio-rustls v0.14.0
[INFO] [stderr]     Checking serde v1.0.116
[INFO] [stderr]     Checking h2 v0.2.2
[INFO] [stderr]     Checking futures-executor v0.3.6
[INFO] [stderr]     Checking futures v0.3.6
[INFO] [stderr]     Checking hyper v0.13.4
[INFO] [stderr]     Checking serde_json v1.0.58
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]     Checking hyper-rustls v0.19.1
[INFO] [stderr]     Checking hyper-rustls v0.21.0
[INFO] [stderr]     Checking reqwest v0.10.8
[INFO] [stderr]     Checking hyper-proxy v0.6.0
[INFO] [stderr]     Checking tbot v0.6.5
[INFO] [stderr]    Compiling ctl10n v0.2.0
[INFO] [stderr]    Compiling rssbot v2.0.0-alpha.9 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting rssbot v2.0.0-alpha.9 (/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(backtrace)]
[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 `rssbot`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rssbot src/main.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-e8218b22857a1d1d.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-95aab379893bf52e.rmeta --extern either=/opt/rustwide/target/debug/deps/libeither-be64a486a4e52c68.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-58f820cff8084378.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-72923b2d9aa06af7.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-d926fdf7c10f1bde.rmeta --extern pinyin=/opt/rustwide/target/debug/deps/libpinyin-6f43bcf5b333e44c.rmeta --extern quick_xml=/opt/rustwide/target/debug/deps/libquick_xml-deaf4c75a902ccbc.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-c91bb9522d433fb9.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-8d7236af6252f82e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-16c0994769fefe38.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-44c9f658f56d3dc2.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-0bef029ea5016e3f.rmeta --extern tbot=/opt/rustwide/target/debug/deps/libtbot-58de87a09919935a.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-bb350f6677f066e6.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-6479282c7516ae8a.rmeta --cap-lints=warn --crate-version 2.0.0-alpha.9` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d0851aa96f8a4a4e28b99fbc1250a6ec35d09dd816db7f7f583215dd9d5c38e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0851aa96f8a4a4e28b99fbc1250a6ec35d09dd816db7f7f583215dd9d5c38e6", kill_on_drop: false }`
[INFO] [stdout] d0851aa96f8a4a4e28b99fbc1250a6ec35d09dd816db7f7f583215dd9d5c38e6
