[INFO] fetching crate cv 0.6.0...
[INFO] documenting cv-0.6.0 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate cv 0.6.0 into /workspace/builds/worker-93/source
[INFO] validating manifest of crates.io crate cv 0.6.0 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 cv 0.6.0
[INFO] finished tweaking crates.io crate cv 0.6.0
[INFO] tweaked toml for crates.io crate cv 0.6.0 written to /workspace/builds/worker-93/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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] e3b21e27806b153fcbcfad8e85349444d06ffa29bf8b77a82fafc96549c8fea0
[INFO] running `Command { std: "docker" "start" "-a" "e3b21e27806b153fcbcfad8e85349444d06ffa29bf8b77a82fafc96549c8fea0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3b21e27806b153fcbcfad8e85349444d06ffa29bf8b77a82fafc96549c8fea0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3b21e27806b153fcbcfad8e85349444d06ffa29bf8b77a82fafc96549c8fea0", kill_on_drop: false }`
[INFO] [stdout] e3b21e27806b153fcbcfad8e85349444d06ffa29bf8b77a82fafc96549c8fea0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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] 3a98fe069ef2ef0e01ba6e0bb54cd88c9bb1efb2936ec0412e7c63244069a5ac
[INFO] running `Command { std: "docker" "start" "-a" "3a98fe069ef2ef0e01ba6e0bb54cd88c9bb1efb2936ec0412e7c63244069a5ac", kill_on_drop: false }`
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking sample-consensus v1.0.2
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking float-ord v0.2.0
[INFO] [stderr]    Compiling ndarray v0.13.1
[INFO] [stderr]     Checking hamming v0.1.3
[INFO] [stderr]     Checking primal-estimate v0.3.1
[INFO] [stderr]     Checking color_quant v1.1.0
[INFO] [stderr]     Checking space v0.10.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking bytemuck v1.7.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking ahash v0.3.8
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling hashbrown v0.7.2
[INFO] [stderr]     Checking matrixmultiply v0.2.4
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking primal-bit v0.3.0
[INFO] [stderr]     Checking bitarray v0.2.6
[INFO] [stderr]     Checking primal-sieve v0.3.1
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/bitarray-0.2.6/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(min_const_generics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bitarray` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3a98fe069ef2ef0e01ba6e0bb54cd88c9bb1efb2936ec0412e7c63244069a5ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a98fe069ef2ef0e01ba6e0bb54cd88c9bb1efb2936ec0412e7c63244069a5ac", kill_on_drop: false }`
[INFO] [stdout] 3a98fe069ef2ef0e01ba6e0bb54cd88c9bb1efb2936ec0412e7c63244069a5ac
