[INFO] cloning repository https://github.com/spica314/neco3
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/spica314/neco3" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspica314%2Fneco3", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspica314%2Fneco3'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 646fcf82146cb0f76cfc9ff7a695b561de1a515d
[INFO] documenting spica314/neco3 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspica314%2Fneco3" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/spica314/neco3 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/spica314/neco3
[INFO] finished tweaking git repo https://github.com/spica314/neco3
[INFO] tweaked toml for git repo https://github.com/spica314/neco3 written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] crate git repo https://github.com/spica314/neco3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 811a1bf0870d7a14b23900291e8ac9f861660be1dd36576a37b94005b1be8d46
[INFO] running `Command { std: "docker" "start" "-a" "811a1bf0870d7a14b23900291e8ac9f861660be1dd36576a37b94005b1be8d46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "811a1bf0870d7a14b23900291e8ac9f861660be1dd36576a37b94005b1be8d46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "811a1bf0870d7a14b23900291e8ac9f861660be1dd36576a37b94005b1be8d46", kill_on_drop: false }`
[INFO] [stdout] 811a1bf0870d7a14b23900291e8ac9f861660be1dd36576a37b94005b1be8d46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c4e39748c0d20dc38ad051cbc64ee8f84092519b6574fc55cbd40010dee4b13
[INFO] running `Command { std: "docker" "start" "-a" "2c4e39748c0d20dc38ad051cbc64ee8f84092519b6574fc55cbd40010dee4b13", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]     Checking unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]     Checking neco-table v0.1.0 (/opt/rustwide/workdir/src/neco-table)
[INFO] [stderr]  Documenting neco-ir v0.1.0 (/opt/rustwide/workdir/src/neco-ir)
[INFO] [stderr]  Documenting neco v0.1.0 (/opt/rustwide/workdir/src/neco)
[INFO] [stderr]  Documenting neco-types-and-values v0.1.0 (/opt/rustwide/workdir/src/neco-types-and-values)
[INFO] [stderr]  Documenting neco-table v0.1.0 (/opt/rustwide/workdir/src/neco-table)
[INFO] [stderr]  Documenting neco-syn v0.1.0 (/opt/rustwide/workdir/src/neco-syn)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/neco-syn/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(once_cell)]
[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 document `neco-syn`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name neco_syn src/neco-syn/src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=64964b0b08ee41c5 -L dependency=/opt/rustwide/target/debug/deps --extern neco_table=/opt/rustwide/target/debug/deps/libneco_table-bb8d2c326ff442e6.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2c4e39748c0d20dc38ad051cbc64ee8f84092519b6574fc55cbd40010dee4b13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c4e39748c0d20dc38ad051cbc64ee8f84092519b6574fc55cbd40010dee4b13", kill_on_drop: false }`
[INFO] [stdout] 2c4e39748c0d20dc38ad051cbc64ee8f84092519b6574fc55cbd40010dee4b13