[INFO] fetching crate eng-wasm-derive 0.1.7...
[INFO] documenting eng-wasm-derive-0.1.7 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate eng-wasm-derive 0.1.7 into /workspace/builds/worker-42/source
[INFO] validating manifest of crates.io crate eng-wasm-derive 0.1.7 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 eng-wasm-derive 0.1.7
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate eng-wasm-derive 0.1.7
[INFO] tweaked toml for crates.io crate eng-wasm-derive 0.1.7 written to /workspace/builds/worker-42/source/Cargo.toml
[INFO] crate crates.io crate eng-wasm-derive 0.1.7 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 ethabi v6.1.0
[INFO] [stderr]   Downloaded eng-wasm v0.1.6
[INFO] [stderr]   Downloaded rustc-hex v2.0.1
[INFO] [stderr]   Downloaded parse-display-derive v0.1.1
[INFO] [stderr]   Downloaded eng-pwasm-abi v0.3.2
[INFO] [stderr]   Downloaded proc-macro2 v1.0.4
[INFO] [stderr]   Downloaded parse-display v0.1.1
[INFO] [stderr]   Downloaded uint v0.6.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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] 942e85bff3b50ba8539d03ad46698808912b409b8ad9204678d03974019a9bca
[INFO] running `Command { std: "docker" "start" "-a" "942e85bff3b50ba8539d03ad46698808912b409b8ad9204678d03974019a9bca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "942e85bff3b50ba8539d03ad46698808912b409b8ad9204678d03974019a9bca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "942e85bff3b50ba8539d03ad46698808912b409b8ad9204678d03974019a9bca", kill_on_drop: false }`
[INFO] [stdout] 942e85bff3b50ba8539d03ad46698808912b409b8ad9204678d03974019a9bca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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] 9372cd18b3e1d9d98f0e9a94497a6a5a2dab2e761d949136a82d6c6795d90059
[INFO] running `Command { std: "docker" "start" "-a" "9372cd18b3e1d9d98f0e9a94497a6a5a2dab2e761d949136a82d6c6795d90059", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.4
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling cc v1.0.45
[INFO] [stderr]     Checking rustc-hex v2.0.1
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking uint v0.4.1
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking quote v1.0.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking fixed-hash v0.2.5
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]     Checking backtrace v0.3.38
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]    Compiling parse-display-derive v0.1.1
[INFO] [stderr]     Checking parse-display v0.1.1
[INFO] [stderr]     Checking ethereum-types-serialize v0.2.2
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking ethbloom v0.5.3
[INFO] [stderr]     Checking ethereum-types v0.4.2
[INFO] [stderr]     Checking ethabi v6.1.0
[INFO] [stderr]  Documenting eng-wasm-derive v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_concat_trait)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this URL is not a hyperlink
[INFO] [stdout]  --> src/reduce_mut.rs:6:38
[INFO] [stdout]   |
[INFO] [stdout] 6 | /// This is a slight modification of https://github.com/dtolnay/reduce
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<https://github.com/dtolnay/reduce>`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(rustdoc::bare_urls)]` on by default
[INFO] [stdout]   = note: bare URLs are not automatically turned into clickable links
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `eng-wasm-derive`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name eng_wasm_derive src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=fc21f67014a0a4bc -L dependency=/opt/rustwide/target/debug/deps --extern ethabi=/opt/rustwide/target/debug/deps/libethabi-4c0f07c0e57a73c9.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-680f8b9cbbc1b595.rmeta --extern parse_display=/opt/rustwide/target/debug/deps/libparse_display-f573bf100f09645a.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-76bbd6a4aa41d456.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-fde7fc546a147a78.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-4f3ea1809dad77d6.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-882e4b3086bd6c2d.rmeta --extern tiny_keccak=/opt/rustwide/target/debug/deps/libtiny_keccak-c0867e2891fca60f.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.7` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9372cd18b3e1d9d98f0e9a94497a6a5a2dab2e761d949136a82d6c6795d90059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9372cd18b3e1d9d98f0e9a94497a6a5a2dab2e761d949136a82d6c6795d90059", kill_on_drop: false }`
[INFO] [stdout] 9372cd18b3e1d9d98f0e9a94497a6a5a2dab2e761d949136a82d6c6795d90059