[INFO] fetching crate eng-wasm-derive 0.1.7...
[INFO] documenting eng-wasm-derive-0.1.7 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate eng-wasm-derive 0.1.7 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate eng-wasm-derive 0.1.7 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-9/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" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47ecc5e5fd3e109a5a63a15b80601cb9b57bbd84f329e22cd7daa192e6d7d8a5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "47ecc5e5fd3e109a5a63a15b80601cb9b57bbd84f329e22cd7daa192e6d7d8a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47ecc5e5fd3e109a5a63a15b80601cb9b57bbd84f329e22cd7daa192e6d7d8a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47ecc5e5fd3e109a5a63a15b80601cb9b57bbd84f329e22cd7daa192e6d7d8a5", kill_on_drop: false }`
[INFO] [stdout] 47ecc5e5fd3e109a5a63a15b80601cb9b57bbd84f329e22cd7daa192e6d7d8a5
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cbf9ee306e88fdee50f808bd4b7e8ea57d8542b294d4de89b32726bc6ac03c4b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cbf9ee306e88fdee50f808bd4b7e8ea57d8542b294d4de89b32726bc6ac03c4b", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]     Checking rustc-hex v2.0.1
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking proc-macro2 v1.0.4
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking backtrace v0.3.38
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]     Checking quote v1.0.2
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking fixed-hash v0.2.5
[INFO] [stderr]     Checking uint v0.4.1
[INFO] [stderr]     Checking regex v1.3.1
[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 serde v1.0.101
[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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_concat_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern ethabi=/opt/rustwide/target/debug/deps/libethabi-a54f55c714f4d071.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-39630137ca2a75ae.rmeta --extern parse_display=/opt/rustwide/target/debug/deps/libparse_display-cd815263e9382670.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-5afec381071c5dd6.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-539675579447ce46.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-17766b16049904c1.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-8a65c7bef9d955d6.rmeta --extern tiny_keccak=/opt/rustwide/target/debug/deps/libtiny_keccak-983c252cdf0709f7.rmeta --extern proc_macro --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "cbf9ee306e88fdee50f808bd4b7e8ea57d8542b294d4de89b32726bc6ac03c4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbf9ee306e88fdee50f808bd4b7e8ea57d8542b294d4de89b32726bc6ac03c4b", kill_on_drop: false }`
[INFO] [stdout] cbf9ee306e88fdee50f808bd4b7e8ea57d8542b294d4de89b32726bc6ac03c4b