[INFO] cloning repository https://github.com/hermitcore/rusty-loader
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hermitcore/rusty-loader" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhermitcore%2Frusty-loader", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhermitcore%2Frusty-loader'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b30fb1cf23f33cc98f01e8d689a27b95bb78ec64
[INFO] documenting hermitcore/rusty-loader against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhermitcore%2Frusty-loader" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hermitcore/rusty-loader on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-3/source/.cargo/config
[INFO] started tweaking git repo https://github.com/hermitcore/rusty-loader
[INFO] finished tweaking git repo https://github.com/hermitcore/rusty-loader
[INFO] tweaked toml for git repo https://github.com/hermitcore/rusty-loader written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/hermitcore/rusty-loader already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bit_field v0.10.0
[INFO] [stderr]   Downloaded multiboot v0.3.0
[INFO] [stderr]   Downloaded raw-cpuid v8.1.0
[INFO] [stderr]   Downloaded x86 v0.34.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 565a322a554bc83bbcc46d6589e06b023043dbb0269c279eda31606df90bdcdd
[INFO] running `Command { std: "docker" "start" "-a" "565a322a554bc83bbcc46d6589e06b023043dbb0269c279eda31606df90bdcdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "565a322a554bc83bbcc46d6589e06b023043dbb0269c279eda31606df90bdcdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "565a322a554bc83bbcc46d6589e06b023043dbb0269c279eda31606df90bdcdd", kill_on_drop: false }`
[INFO] [stdout] 565a322a554bc83bbcc46d6589e06b023043dbb0269c279eda31606df90bdcdd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 553193a8a8f52002446f46744fea27e1496f5dae18630ef9f81249d429470d77
[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" "553193a8a8f52002446f46744fea27e1496f5dae18630ef9f81249d429470d77", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86 v0.34.0
[INFO] [stderr]     Checking bit_field v0.10.0
[INFO] [stderr]    Compiling rusty-loader v0.2.5 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking multiboot v0.3.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling raw-cpuid v8.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/x86-0.34.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(llvm_asm, core_intrinsics)]
[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 `x86`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "553193a8a8f52002446f46744fea27e1496f5dae18630ef9f81249d429470d77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "553193a8a8f52002446f46744fea27e1496f5dae18630ef9f81249d429470d77", kill_on_drop: false }`
[INFO] [stdout] 553193a8a8f52002446f46744fea27e1496f5dae18630ef9f81249d429470d77