[INFO] fetching crate blagger 0.3.0...
[INFO] documenting blagger-0.3.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate blagger 0.3.0 into /workspace/builds/worker-82/source
[INFO] validating manifest of crates.io crate blagger 0.3.0 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 crates.io crate blagger 0.3.0
[INFO] finished tweaking crates.io crate blagger 0.3.0
[INFO] tweaked toml for crates.io crate blagger 0.3.0 written to /workspace/builds/worker-82/source/Cargo.toml
[INFO] crate crates.io crate blagger 0.3.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded structopt-derive v0.4.7
[INFO] [stderr]   Downloaded proc-macro-error-attr v1.0.2
[INFO] [stderr]   Downloaded proc-macro2 v1.0.13
[INFO] [stderr]   Downloaded structopt v0.3.14
[INFO] [stderr]   Downloaded rss v1.9.0
[INFO] [stderr]   Downloaded quote v1.0.5
[INFO] [stderr]   Downloaded serde_derive v1.0.110
[INFO] [stderr]   Downloaded quick-xml v0.17.2
[INFO] [stderr]   Downloaded pulldown-cmark v0.7.1
[INFO] [stderr]   Downloaded proc-macro-error v1.0.2
[INFO] [stderr]   Downloaded tinytemplate v1.0.4
[INFO] [stderr]   Downloaded serde v1.0.110
[INFO] [stderr]   Downloaded syn v1.0.22
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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] 25692bd6ce2d5665e62d18dfb34dcc2d6306e8f5092b91251ae07ac308ca5d73
[INFO] running `Command { std: "docker" "start" "-a" "25692bd6ce2d5665e62d18dfb34dcc2d6306e8f5092b91251ae07ac308ca5d73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "25692bd6ce2d5665e62d18dfb34dcc2d6306e8f5092b91251ae07ac308ca5d73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25692bd6ce2d5665e62d18dfb34dcc2d6306e8f5092b91251ae07ac308ca5d73", kill_on_drop: false }`
[INFO] [stdout] 25692bd6ce2d5665e62d18dfb34dcc2d6306e8f5092b91251ae07ac308ca5d73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-82/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] [stdout] e514508f718e31117663eff5f47110d171b6ad114565ffa6d30bbf045ee0c37e
[INFO] running `Command { std: "docker" "start" "-a" "e514508f718e31117663eff5f47110d171b6ad114565ffa6d30bbf045ee0c37e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.13
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.22
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling ryu v1.0.4
[INFO] [stderr]    Compiling encoding_rs v0.8.23
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling derive_builder v0.9.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling pulldown-cmark v0.7.1
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling quote v1.0.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]     Checking quick-xml v0.17.2
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling structopt-derive v0.4.7
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling derive_builder_core v0.9.0
[INFO] [stderr]     Checking structopt v0.3.14
[INFO] [stderr]     Checking rss v1.9.0
[INFO] [stderr]     Checking serde_json v1.0.53
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking tinytemplate v1.0.4
[INFO] [stderr]  Documenting blagger v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(str_split_once)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `blagger`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name blagger src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=a2d8ef616964cdc5 -L dependency=/opt/rustwide/target/debug/deps --extern pulldown_cmark=/opt/rustwide/target/debug/deps/libpulldown_cmark-66d17a6f2f37c1b1.rmeta --extern rss=/opt/rustwide/target/debug/deps/librss-51fa568a2630f36d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-94b8d01961062f1a.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-4c9a7f72fc53e163.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-5322cc9ce04f5e19.rmeta --extern tinytemplate=/opt/rustwide/target/debug/deps/libtinytemplate-c2510ffa66896af7.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-098f0168744a6371.rmeta --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e514508f718e31117663eff5f47110d171b6ad114565ffa6d30bbf045ee0c37e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e514508f718e31117663eff5f47110d171b6ad114565ffa6d30bbf045ee0c37e", kill_on_drop: false }`
[INFO] [stdout] e514508f718e31117663eff5f47110d171b6ad114565ffa6d30bbf045ee0c37e