[INFO] fetching crate multiproof-rs 0.1.9...
[INFO] documenting multiproof-rs-0.1.9 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate multiproof-rs 0.1.9 into /workspace/builds/worker-73/source
[INFO] validating manifest of crates.io crate multiproof-rs 0.1.9 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate multiproof-rs 0.1.9
[INFO] finished tweaking crates.io crate multiproof-rs 0.1.9
[INFO] tweaked toml for crates.io crate multiproof-rs 0.1.9 written to /workspace/builds/worker-73/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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" "+beta-2021-08-01" "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-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] efcafd197b5f4bb0be434ae0dc72e2e080130ee8a4af4ccd2d007d33c30f1713
[INFO] running `Command { std: "docker" "start" "-a" "efcafd197b5f4bb0be434ae0dc72e2e080130ee8a4af4ccd2d007d33c30f1713", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "efcafd197b5f4bb0be434ae0dc72e2e080130ee8a4af4ccd2d007d33c30f1713", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efcafd197b5f4bb0be434ae0dc72e2e080130ee8a4af4ccd2d007d33c30f1713", kill_on_drop: false }`
[INFO] [stdout] efcafd197b5f4bb0be434ae0dc72e2e080130ee8a4af4ccd2d007d33c30f1713
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c8eaf5a3ea2754314078a1422edefbf0814e7cd62c607e5846bbdb4f501084c
[INFO] running `Command { std: "docker" "start" "-a" "3c8eaf5a3ea2754314078a1422edefbf0814e7cd62c607e5846bbdb4f501084c", kill_on_drop: false }`
[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 typenum v1.13.0
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking keccak v0.1.0
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]     Checking half v1.7.1
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]     Checking rlp v0.4.6
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking sha3 v0.8.2
[INFO] [stderr]     Checking serde_cbor v0.10.2
[INFO] [stderr]     Checking serde_json v1.0.66
[INFO] [stderr]  Documenting multiproof-rs v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax, box_patterns)]
[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 `multiproof-rs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name multiproof_rs 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 hex=/opt/rustwide/target/debug/deps/libhex-3303e62dbe377562.rmeta --extern rlp=/opt/rustwide/target/debug/deps/librlp-dd284ab83f0ca1ce.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-8914c1b130a4d038.rmeta --extern serde_cbor=/opt/rustwide/target/debug/deps/libserde_cbor-58c01a344d5c00b9.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-bb7233c1e238a968.rmeta --extern sha3=/opt/rustwide/target/debug/deps/libsha3-eadbdb9e7c0fb1e7.rmeta --cap-lints=warn --crate-version 0.1.9` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "3c8eaf5a3ea2754314078a1422edefbf0814e7cd62c607e5846bbdb4f501084c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c8eaf5a3ea2754314078a1422edefbf0814e7cd62c607e5846bbdb4f501084c", kill_on_drop: false }`
[INFO] [stdout] 3c8eaf5a3ea2754314078a1422edefbf0814e7cd62c607e5846bbdb4f501084c
