[INFO] cloning repository https://github.com/Brecert/mc-utils
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Brecert/mc-utils" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrecert%2Fmc-utils", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrecert%2Fmc-utils'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f018ce3b12a28f4cf01c02d184639cb39ca2c0c2
[INFO] documenting Brecert/mc-utils against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrecert%2Fmc-utils" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Brecert/mc-utils 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 git repo https://github.com/Brecert/mc-utils
[INFO] finished tweaking git repo https://github.com/Brecert/mc-utils
[INFO] tweaked toml for git repo https://github.com/Brecert/mc-utils written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Brecert/mc-utils 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 33bb4aac6b4e88aeac4e5ab882d21b7e54a9b775b7c6de3d987b9acb9e49299c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "33bb4aac6b4e88aeac4e5ab882d21b7e54a9b775b7c6de3d987b9acb9e49299c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33bb4aac6b4e88aeac4e5ab882d21b7e54a9b775b7c6de3d987b9acb9e49299c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33bb4aac6b4e88aeac4e5ab882d21b7e54a9b775b7c6de3d987b9acb9e49299c", kill_on_drop: false }`
[INFO] [stdout] 33bb4aac6b4e88aeac4e5ab882d21b7e54a9b775b7c6de3d987b9acb9e49299c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 0f54b4f65e0bb63d6d80b00970d49adca937a173790cd541e4d617c486ce270f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0f54b4f65e0bb63d6d80b00970d49adca937a173790cd541e4d617c486ce270f", kill_on_drop: false }`
[INFO] [stderr]     Checking once_cell v1.7.0
[INFO] [stderr]    Compiling serde_json v1.0.63
[INFO] [stderr]    Compiling minreq v2.3.1
[INFO] [stderr]     Checking textcode v0.2.1
[INFO] [stderr]     Checking owo-colors v1.3.0
[INFO] [stderr]     Checking css-color-parser2 v1.0.1
[INFO] [stderr]    Compiling binread_derive v1.4.3
[INFO] [stderr]    Compiling nop-json-derive v1.1.4 (https://github.com/jeremiah-shaulov/nop-json-derive?branch=master#6466ffdb)
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking ring v0.16.20
[INFO] [stderr]     Checking webpki v0.21.4
[INFO] [stderr]     Checking sct v0.6.0
[INFO] [stderr]     Checking webpki-roots v0.18.0
[INFO] [stderr]     Checking rustls v0.19.0
[INFO] [stderr]     Checking craftping v0.2.1
[INFO] [stderr]     Checking nop-json v1.0.9
[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/nop-json-1.0.9/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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 `nop-json`
[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" "0f54b4f65e0bb63d6d80b00970d49adca937a173790cd541e4d617c486ce270f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f54b4f65e0bb63d6d80b00970d49adca937a173790cd541e4d617c486ce270f", kill_on_drop: false }`
[INFO] [stdout] 0f54b4f65e0bb63d6d80b00970d49adca937a173790cd541e4d617c486ce270f
