[INFO] fetching crate ascetic_cli 0.0.2...
[INFO] documenting ascetic_cli-0.0.2 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate ascetic_cli 0.0.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ascetic_cli 0.0.2 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 ascetic_cli 0.0.2
[INFO] finished tweaking crates.io crate ascetic_cli 0.0.2
[INFO] tweaked toml for crates.io crate ascetic_cli 0.0.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate ascetic_cli 0.0.2 already has a lockfile, it will not be regenerated
[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-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" "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] 95fdbd9565bb48881ec409e4ab75af776aa951fd36cd2a544aee471cb77282c4
[INFO] running `Command { std: "docker" "start" "-a" "95fdbd9565bb48881ec409e4ab75af776aa951fd36cd2a544aee471cb77282c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "95fdbd9565bb48881ec409e4ab75af776aa951fd36cd2a544aee471cb77282c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95fdbd9565bb48881ec409e4ab75af776aa951fd36cd2a544aee471cb77282c4", kill_on_drop: false }`
[INFO] [stdout] 95fdbd9565bb48881ec409e4ab75af776aa951fd36cd2a544aee471cb77282c4
[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" "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] af0b3d9a4ce4f030947d96349f3b2e048fa3158133f0b5f87e35c7904df3c0e9
[INFO] running `Command { std: "docker" "start" "-a" "af0b3d9a4ce4f030947d96349f3b2e048fa3158133f0b5f87e35c7904df3c0e9", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]     Checking varisat-formula v0.2.1
[INFO] [stderr]    Compiling ordermap v0.3.5
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling fixedbitset v0.1.9
[INFO] [stderr]    Compiling bit-vec v0.5.1
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]     Checking hashbrown v0.3.1
[INFO] [stderr]     Checking siphasher v0.3.2
[INFO] [stderr]    Compiling diff v0.1.12
[INFO] [stderr]     Checking vec_mut_scan v0.1.0
[INFO] [stderr]    Compiling beef v0.4.2
[INFO] [stderr]    Compiling utf8-ranges v1.0.4
[INFO] [stderr]     Checking leb128 v0.2.4
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking bit-vec v0.6.1
[INFO] [stderr]     Checking enquote v1.0.3
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]    Compiling ena v0.13.1
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling bit-set v0.5.1
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling string_cache_codegen v0.4.4
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]     Checking phf_shared v0.8.0
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling petgraph v0.4.13
[INFO] [stderr]     Checking string_cache v0.8.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]     Checking fern v0.6.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.35
[INFO] [stderr]    Compiling sha2 v0.8.1
[INFO] [stderr]    Compiling string_cache v0.7.5
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling ascii-canvas v2.0.0
[INFO] [stderr]     Checking ordered-float v1.0.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking regex v1.3.6
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking backtrace v0.3.46
[INFO] [stderr]     Checking lalrpop-util v0.18.1
[INFO] [stderr]     Checking fern v0.5.9
[INFO] [stderr]    Compiling logos-derive v0.11.0-rc5
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking varisat-dimacs v0.2.1
[INFO] [stderr]     Checking varisat-internal-proof v0.2.1
[INFO] [stderr]    Compiling varisat v0.2.1
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]     Checking varisat-checker v0.2.1
[INFO] [stderr]    Compiling partial_ref_derive v0.3.1
[INFO] [stderr]    Compiling varisat-internal-macros v0.2.1
[INFO] [stderr]    Compiling lalrpop v0.18.1
[INFO] [stderr]     Checking partial_ref v0.3.1
[INFO] [stderr]     Checking logos v0.11.0-rc5
[INFO] [stderr]     Checking aces v0.0.13
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/aces-0.0.13/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(bool_to_option)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 `aces`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "af0b3d9a4ce4f030947d96349f3b2e048fa3158133f0b5f87e35c7904df3c0e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af0b3d9a4ce4f030947d96349f3b2e048fa3158133f0b5f87e35c7904df3c0e9", kill_on_drop: false }`
[INFO] [stdout] af0b3d9a4ce4f030947d96349f3b2e048fa3158133f0b5f87e35c7904df3c0e9
