[INFO] fetching crate cxmr-orderbook 0.0.1...
[INFO] documenting cxmr-orderbook-0.0.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate cxmr-orderbook 0.0.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate cxmr-orderbook 0.0.1 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", 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-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2020-08-29" "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] 3132f41aebef3ec19bdd8fa468cf6fc4ee8ed3eefe6ae0e8932cc0552521f4a3
[INFO] running `Command { std: "docker" "start" "-a" "3132f41aebef3ec19bdd8fa468cf6fc4ee8ed3eefe6ae0e8932cc0552521f4a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3132f41aebef3ec19bdd8fa468cf6fc4ee8ed3eefe6ae0e8932cc0552521f4a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3132f41aebef3ec19bdd8fa468cf6fc4ee8ed3eefe6ae0e8932cc0552521f4a3", kill_on_drop: false }`
[INFO] [stdout] 3132f41aebef3ec19bdd8fa468cf6fc4ee8ed3eefe6ae0e8932cc0552521f4a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2020-08-29" "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] 12c6d323dac6348d96a3c104535f52c9db3bd67adb67e0274358d4ff8ae5811b
[INFO] running `Command { std: "docker" "start" "-a" "12c6d323dac6348d96a3c104535f52c9db3bd67adb67e0274358d4ff8ae5811b", kill_on_drop: false }`
[INFO] [stderr]     Checking err-convert-macro v0.0.1
[INFO] [stderr]     Checking hashbrown v0.1.8
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking cxmr-balances v0.0.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking cxmr-currency 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 beta 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-c43c91656aba4e86.rmeta --extern cxmr_exchanges=/opt/rustwide/target/debug/deps/libcxmr_exchanges-431ea644b9bed42f.rmeta --extern cxmr_feeds=/opt/rustwide/target/debug/deps/libcxmr_feeds-e415af5a45ba4609.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-3d0ba9b30d5da469.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-8b25aaf2e71705fc.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ec5e695d7e4b5284.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-3a89c57880b62507.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-c4ec997ff5337c19.rmeta --cap-lints=warn --crate-version 0.0.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "12c6d323dac6348d96a3c104535f52c9db3bd67adb67e0274358d4ff8ae5811b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12c6d323dac6348d96a3c104535f52c9db3bd67adb67e0274358d4ff8ae5811b", kill_on_drop: false }`
[INFO] [stdout] 12c6d323dac6348d96a3c104535f52c9db3bd67adb67e0274358d4ff8ae5811b