[INFO] fetching crate esl 0.8.0...
[INFO] documenting esl-0.8.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate esl 0.8.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate esl 0.8.0 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 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-9/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stdout] fed4742c551def37cd5e1ad12ecc79d4021317f76761c538d52c86c376b765f1
[INFO] running `Command { std: "docker" "start" "-a" "fed4742c551def37cd5e1ad12ecc79d4021317f76761c538d52c86c376b765f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fed4742c551def37cd5e1ad12ecc79d4021317f76761c538d52c86c376b765f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fed4742c551def37cd5e1ad12ecc79d4021317f76761c538d52c86c376b765f1", kill_on_drop: false }`
[INFO] [stdout] fed4742c551def37cd5e1ad12ecc79d4021317f76761c538d52c86c376b765f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 8bd2c6b471caf36f7918998f93899550be571f3da2415136806a72ce9878b6fd
[INFO] running `Command { std: "docker" "start" "-a" "8bd2c6b471caf36f7918998f93899550be571f3da2415136806a72ce9878b6fd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]     Checking enum-derive-2018 v1.0.2
[INFO] [stderr]     Checking macro-attr-2018 v1.1.1
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking nameof v1.2.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.0
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking encoding-index-japanese 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-simpchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]     Checking encoding v0.2.33
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling enumn v0.1.3
[INFO] [stderr]    Compiling enum-ordinalize v3.1.10
[INFO] [stderr]    Compiling educe v0.4.18
[INFO] [stderr]    Compiling serde v1.0.127
[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]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-97875349cab274e6.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-c759f8d07719039e.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-b55b8e72bfe1c077.rmeta --extern educe=/opt/rustwide/target/debug/deps/libeduce-f7733d41a70ec199.so --extern either=/opt/rustwide/target/debug/deps/libeither-77dfe041c4dc4255.rmeta --extern encoding=/opt/rustwide/target/debug/deps/libencoding-0b10d2f9eabc9d07.rmeta --extern enum_derive_2018=/opt/rustwide/target/debug/deps/libenum_derive_2018-a0be54d06f0415e1.rmeta --extern enumn=/opt/rustwide/target/debug/deps/libenumn-5754289a39007270.so --extern flate2=/opt/rustwide/target/debug/deps/libflate2-e46d5f02466b62fa.rmeta --extern macro_attr_2018=/opt/rustwide/target/debug/deps/libmacro_attr_2018-6688928b7b0b436a.rmeta --extern nameof=/opt/rustwide/target/debug/deps/libnameof-0416931a9fc97ae6.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-20da5518b0a32c98.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-1b80003de675d828.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-4ab2fd0aefd2fc60.rmeta --cap-lints=warn --crate-version 0.8.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8bd2c6b471caf36f7918998f93899550be571f3da2415136806a72ce9878b6fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bd2c6b471caf36f7918998f93899550be571f3da2415136806a72ce9878b6fd", kill_on_drop: false }`
[INFO] [stdout] 8bd2c6b471caf36f7918998f93899550be571f3da2415136806a72ce9878b6fd
