[INFO] fetching crate esl 0.8.0...
[INFO] documenting esl-0.8.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate esl 0.8.0 into /workspace/builds/worker-79/source
[INFO] validating manifest of crates.io crate esl 0.8.0 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 esl 0.8.0
[INFO] finished tweaking crates.io crate esl 0.8.0
[INFO] tweaked toml for crates.io crate esl 0.8.0 written to /workspace/builds/worker-79/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded enum-ordinalize v3.1.11
[INFO] [stderr]   Downloaded enumn v0.1.4
[INFO] [stderr]   Downloaded nameof v1.2.2
[INFO] [stderr]   Downloaded educe v0.4.19
[INFO] [stderr]   Downloaded macro-attr-2018 v1.1.2
[INFO] [stderr]   Downloaded enum-derive-2018 v1.0.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/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] ff17f697c033b56313502962a5f7f23b93c1dbf8bc56d0afbd997d160cc9f56e
[INFO] running `Command { std: "docker" "start" "-a" "ff17f697c033b56313502962a5f7f23b93c1dbf8bc56d0afbd997d160cc9f56e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff17f697c033b56313502962a5f7f23b93c1dbf8bc56d0afbd997d160cc9f56e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff17f697c033b56313502962a5f7f23b93c1dbf8bc56d0afbd997d160cc9f56e", kill_on_drop: false }`
[INFO] [stdout] ff17f697c033b56313502962a5f7f23b93c1dbf8bc56d0afbd997d160cc9f56e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-79/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] 989b5f26d12de9c161051658c979088a1b10bd5de1b1046ff07352324a02058a
[INFO] running `Command { std: "docker" "start" "-a" "989b5f26d12de9c161051658c979088a1b10bd5de1b1046ff07352324a02058a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking ryu v1.0.10
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking nameof v1.2.2
[INFO] [stderr]     Checking macro-attr-2018 v1.1.2
[INFO] [stderr]     Checking enum-derive-2018 v1.0.2
[INFO] [stderr]     Checking encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-korean v1.20141219.5
[INFO] [stderr]     Checking encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]     Checking encoding-index-japanese v1.20141219.5
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]     Checking encoding v0.2.33
[INFO] [stderr]     Checking flate2 v1.0.24
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling enum-ordinalize v3.1.11
[INFO] [stderr]    Compiling enumn v0.1.4
[INFO] [stderr]    Compiling educe v0.4.19
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling esl v0.8.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting esl v0.8.0 (/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(type_alias_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(macro_attributes_in_derive_output)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `macro_attributes_in_derive_output` has been stable since 1.57.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `esl`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name esl src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=20398f7741ed525c -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-17ec5adbf323ad47.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-22d7f70832a3b85e.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-7c274f399d426ec2.rmeta --extern educe=/opt/rustwide/target/debug/deps/libeduce-cde53c102200ca96.so --extern either=/opt/rustwide/target/debug/deps/libeither-597c6487d149706e.rmeta --extern encoding=/opt/rustwide/target/debug/deps/libencoding-0acf078df33b0b95.rmeta --extern enum_derive_2018=/opt/rustwide/target/debug/deps/libenum_derive_2018-2eeae7e9d15f1968.rmeta --extern enumn=/opt/rustwide/target/debug/deps/libenumn-41c81a872766d223.so --extern flate2=/opt/rustwide/target/debug/deps/libflate2-f38605f162afeaf0.rmeta --extern macro_attr_2018=/opt/rustwide/target/debug/deps/libmacro_attr_2018-ed691a2279fd44e0.rmeta --extern nameof=/opt/rustwide/target/debug/deps/libnameof-a50da6a15ea8dfa3.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-7f668a7cd9a00dd6.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-f09fca34c233de76.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-d4d6a9fe7dda36ea.rmeta --cap-lints=warn --crate-version 0.8.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "989b5f26d12de9c161051658c979088a1b10bd5de1b1046ff07352324a02058a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "989b5f26d12de9c161051658c979088a1b10bd5de1b1046ff07352324a02058a", kill_on_drop: false }`
[INFO] [stdout] 989b5f26d12de9c161051658c979088a1b10bd5de1b1046ff07352324a02058a