[INFO] fetching crate esl 0.7.0...
[INFO] documenting esl-0.7.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate esl 0.7.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate esl 0.7.0 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 crates.io crate esl 0.7.0
[INFO] finished tweaking crates.io crate esl 0.7.0
[INFO] tweaked toml for crates.io crate esl 0.7.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5e5663d0522436d96b60db90426bae88cfb45b78c59fa90065ae3cebc98e62de
[INFO] running `Command { std: "docker" "start" "-a" "5e5663d0522436d96b60db90426bae88cfb45b78c59fa90065ae3cebc98e62de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e5663d0522436d96b60db90426bae88cfb45b78c59fa90065ae3cebc98e62de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e5663d0522436d96b60db90426bae88cfb45b78c59fa90065ae3cebc98e62de", kill_on_drop: false }`
[INFO] [stdout] 5e5663d0522436d96b60db90426bae88cfb45b78c59fa90065ae3cebc98e62de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8e3bf1cd531b9f0c9a814a9b29f7e6ca5f7eb7cdf1ba75b453a59563016db840
[INFO] running `Command { std: "docker" "start" "-a" "8e3bf1cd531b9f0c9a814a9b29f7e6ca5f7eb7cdf1ba75b453a59563016db840", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.45
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking adler v0.2.3
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking enum-derive-2018 v1.0.1
[INFO] [stderr]     Checking nameof v1.2.1
[INFO] [stderr]     Checking macro-attr-2018 v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling nom v5.1.2
[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-simpchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-japanese v1.20141219.5
[INFO] [stderr]     Checking encoding v0.2.33
[INFO] [stderr]     Checking flate2 v1.0.18
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling enum-ordinalize v3.1.8
[INFO] [stderr]    Compiling enum-primitive-derive v0.2.1
[INFO] [stderr]    Compiling educe v0.4.13
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling esl v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting esl v0.7.0 (/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: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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/libbase64-897b405df49641ae.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-bb6ec8f28ecded21.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-c28f5fd38aa58f5e.rmeta --extern educe=/opt/rustwide/target/debug/deps/libeduce-6357c1348673df3d.so --extern either=/opt/rustwide/target/debug/deps/libeither-e2fab30f477d7bf0.rmeta --extern encoding=/opt/rustwide/target/debug/deps/libencoding-20a79b57a8e3991d.rmeta --extern enum_derive_2018=/opt/rustwide/target/debug/deps/libenum_derive_2018-5d1754d4e7291762.rmeta --extern enum_primitive_derive=/opt/rustwide/target/debug/deps/libenum_primitive_derive-31ae4e000cdf5bf5.so --extern flate2=/opt/rustwide/target/debug/deps/libflate2-ce181c0ce3519c1a.rmeta --extern macro_attr_2018=/opt/rustwide/target/debug/deps/libmacro_attr_2018-28e406d1620dda68.rmeta --extern nameof=/opt/rustwide/target/debug/deps/libnameof-49058c1de17e776b.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-6b3ad11eb272fdfb.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-4e16a00f90cecb20.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-d926fdf7c10f1bde.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-7a48be7d7c854e7f.rmeta --cap-lints=warn --crate-version 0.7.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8e3bf1cd531b9f0c9a814a9b29f7e6ca5f7eb7cdf1ba75b453a59563016db840", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e3bf1cd531b9f0c9a814a9b29f7e6ca5f7eb7cdf1ba75b453a59563016db840", kill_on_drop: false }`
[INFO] [stdout] 8e3bf1cd531b9f0c9a814a9b29f7e6ca5f7eb7cdf1ba75b453a59563016db840
