[INFO] cloning repository https://github.com/OpenCliqueCraft/splinter-proxy
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/OpenCliqueCraft/splinter-proxy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOpenCliqueCraft%2Fsplinter-proxy", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOpenCliqueCraft%2Fsplinter-proxy'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] befe156306d022311f3809f9bc9e6e82d4f3f69f
[INFO] documenting OpenCliqueCraft/splinter-proxy 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%2FOpenCliqueCraft%2Fsplinter-proxy" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/OpenCliqueCraft/splinter-proxy 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/OpenCliqueCraft/splinter-proxy
[INFO] finished tweaking git repo https://github.com/OpenCliqueCraft/splinter-proxy
[INFO] tweaked toml for git repo https://github.com/OpenCliqueCraft/splinter-proxy written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/OpenCliqueCraft/splinter-proxy 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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 4a297a05088a09e0fdc4a4deb96d364d4e04c14eaa33a283baa8b5d565b30974
[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" "4a297a05088a09e0fdc4a4deb96d364d4e04c14eaa33a283baa8b5d565b30974", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a297a05088a09e0fdc4a4deb96d364d4e04c14eaa33a283baa8b5d565b30974", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a297a05088a09e0fdc4a4deb96d364d4e04c14eaa33a283baa8b5d565b30974", kill_on_drop: false }`
[INFO] [stdout] 4a297a05088a09e0fdc4a4deb96d364d4e04c14eaa33a283baa8b5d565b30974
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 3942e6439cfdfd2424c66aaadbf70007d53f790889ab432f4c6ed7bbd79a9398
[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" "3942e6439cfdfd2424c66aaadbf70007d53f790889ab432f4c6ed7bbd79a9398", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking bimap v0.6.1
[INFO] [stderr]    Compiling libz-sys v1.1.3
[INFO] [stderr]    Compiling tokio v1.5.0
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]     Checking simplelog v0.10.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking flate2 v1.0.20
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]    Compiling async-trait v0.1.50
[INFO] [stderr]     Checking thiserror v1.0.24
[INFO] [stderr]     Checking ron v0.6.4
[INFO] [stderr]     Checking mcproto-rs v0.2.0
[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/mcproto-rs-0.2.0/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "bench", feature(test))]
[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 `mcproto-rs`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "3942e6439cfdfd2424c66aaadbf70007d53f790889ab432f4c6ed7bbd79a9398", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3942e6439cfdfd2424c66aaadbf70007d53f790889ab432f4c6ed7bbd79a9398", kill_on_drop: false }`
[INFO] [stdout] 3942e6439cfdfd2424c66aaadbf70007d53f790889ab432f4c6ed7bbd79a9398
