[INFO] fetching crate cxmr-orderbook 0.0.1...
[INFO] documenting cxmr-orderbook-0.0.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate cxmr-orderbook 0.0.1 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate cxmr-orderbook 0.0.1 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 cxmr-orderbook 0.0.1
[INFO] finished tweaking crates.io crate cxmr-orderbook 0.0.1
[INFO] tweaked toml for crates.io crate cxmr-orderbook 0.0.1 written to /workspace/builds/worker-31/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] 17614923c4ff719cc589cc8992a1dc41a847d46ff863d36930383769a329ad06
[INFO] running `Command { std: "docker" "start" "-a" "17614923c4ff719cc589cc8992a1dc41a847d46ff863d36930383769a329ad06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17614923c4ff719cc589cc8992a1dc41a847d46ff863d36930383769a329ad06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17614923c4ff719cc589cc8992a1dc41a847d46ff863d36930383769a329ad06", kill_on_drop: false }`
[INFO] [stdout] 17614923c4ff719cc589cc8992a1dc41a847d46ff863d36930383769a329ad06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] 9fe3d57f6c58612cd6aeeb125ce1ead5b1254fdbac84834dc502e8cca3e810c3
[INFO] running `Command { std: "docker" "start" "-a" "9fe3d57f6c58612cd6aeeb125ce1ead5b1254fdbac84834dc502e8cca3e810c3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]     Checking gimli v0.25.0
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking rustc-demangle v0.1.20
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking err-convert-macro v0.0.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking object v0.26.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]     Checking addr2line v0.16.0
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]     Checking hashbrown v0.1.8
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking cxmr-currency v0.0.1
[INFO] [stderr]     Checking cxmr-balances v0.0.1
[INFO] [stderr]     Checking cxmr-exchanges v0.0.1
[INFO] [stderr]     Checking cxmr-feeds v0.0.1
[INFO] [stderr]  Documenting cxmr-orderbook v0.0.1 (/opt/rustwide/workdir)
[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(test)]
[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 `cxmr-orderbook`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name cxmr_orderbook 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 cxmr_balances=/opt/rustwide/target/debug/deps/libcxmr_balances-92b6babe78455d55.rmeta --extern cxmr_exchanges=/opt/rustwide/target/debug/deps/libcxmr_exchanges-d28ef17d4ffa85d6.rmeta --extern cxmr_feeds=/opt/rustwide/target/debug/deps/libcxmr_feeds-aa78b3fbb8eb2943.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-0e186ca75e8dc660.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-325d2e3c8b888de3.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5678c1422d6b64cb.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-f282cc1f57f3d638.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-9010c99f689210cb.rmeta --cap-lints=warn --crate-version 0.0.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9fe3d57f6c58612cd6aeeb125ce1ead5b1254fdbac84834dc502e8cca3e810c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9fe3d57f6c58612cd6aeeb125ce1ead5b1254fdbac84834dc502e8cca3e810c3", kill_on_drop: false }`
[INFO] [stdout] 9fe3d57f6c58612cd6aeeb125ce1ead5b1254fdbac84834dc502e8cca3e810c3
