[INFO] fetching crate khalas 0.2.0...
[INFO] documenting khalas-0.2.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate khalas 0.2.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate khalas 0.2.0 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 khalas 0.2.0
[INFO] finished tweaking crates.io crate khalas 0.2.0
[INFO] tweaked toml for crates.io crate khalas 0.2.0 written to /workspace/builds/worker-9/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 7701e9ba5fb1e279abb176bd9809f13ee46e2c5bbc95a7ad768f4c5b5413f601
[INFO] running `Command { std: "docker" "start" "-a" "7701e9ba5fb1e279abb176bd9809f13ee46e2c5bbc95a7ad768f4c5b5413f601", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7701e9ba5fb1e279abb176bd9809f13ee46e2c5bbc95a7ad768f4c5b5413f601", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7701e9ba5fb1e279abb176bd9809f13ee46e2c5bbc95a7ad768f4c5b5413f601", kill_on_drop: false }`
[INFO] [stdout] 7701e9ba5fb1e279abb176bd9809f13ee46e2c5bbc95a7ad768f4c5b5413f601
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 9e184bcc9f8ed44d89e4605fe3877fc2635b33a271a2d189c2d7dcc10261cf0d
[INFO] running `Command { std: "docker" "start" "-a" "9e184bcc9f8ed44d89e4605fe3877fc2635b33a271a2d189c2d7dcc10261cf0d", 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling wasm-bindgen v0.2.75
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling pulldown-cmark v0.6.1
[INFO] [stderr]     Checking enclose v1.1.8
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling seed v0.6.0
[INFO] [stderr]    Compiling dbg v1.0.4
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking cookie v0.12.0
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]     Checking phf v0.7.24
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling palette v0.4.1
[INFO] [stderr]    Compiling palette_derive v0.4.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.75
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.75
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]    Compiling derive_rich v0.2.2
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.75
[INFO] [stderr]     Checking futures-util v0.3.16
[INFO] [stderr]     Checking futures-executor v0.3.16
[INFO] [stderr]     Checking futures v0.3.16
[INFO] [stderr]     Checking serde v1.0.127
[INFO] [stderr]     Checking serde_json v1.0.66
[INFO] [stderr]     Checking js-sys v0.3.52
[INFO] [stderr]     Checking console_error_panic_hook v0.1.6
[INFO] [stderr]     Checking web-sys v0.3.52
[INFO] [stderr]     Checking wasm-bindgen-futures v0.4.25
[INFO] [stderr]     Checking gloo-timers v0.2.1
[INFO] [stderr]  Documenting khalas v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(decl_macro)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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(bool_to_option)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `khalas`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name khalas 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 derive_more=/opt/rustwide/target/debug/deps/libderive_more-d25b9caf320e0992.so --extern derive_rich=/opt/rustwide/target/debug/deps/libderive_rich-3a267627ace191f6.so --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-5183ff54085e1086.rmeta --extern palette=/opt/rustwide/target/debug/deps/libpalette-9e3cede1b28ec7db.rmeta --extern seed=/opt/rustwide/target/debug/deps/libseed-d5181a03aae2e127.rmeta --extern wasm_bindgen=/opt/rustwide/target/debug/deps/libwasm_bindgen-3aec55cb5928f796.rmeta --extern web_sys=/opt/rustwide/target/debug/deps/libweb_sys-274c19a36f1dc1ef.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9e184bcc9f8ed44d89e4605fe3877fc2635b33a271a2d189c2d7dcc10261cf0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e184bcc9f8ed44d89e4605fe3877fc2635b33a271a2d189c2d7dcc10261cf0d", kill_on_drop: false }`
[INFO] [stdout] 9e184bcc9f8ed44d89e4605fe3877fc2635b33a271a2d189c2d7dcc10261cf0d
