[INFO] cloning repository https://github.com/attaca/attaca
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/attaca/attaca" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fattaca%2Fattaca", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fattaca%2Fattaca'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 865df52c16599c50b33e86dbbff115eae772f94a
[INFO] documenting attaca/attaca 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%2Fattaca%2Fattaca" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/attaca/attaca 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] started tweaking git repo https://github.com/attaca/attaca
[INFO] removed workspace from git repo https://github.com/attaca/attaca
[INFO] finished tweaking git repo https://github.com/attaca/attaca
[INFO] tweaked toml for git repo https://github.com/attaca/attaca written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/attaca/attaca 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] error: the lock file /workspace/builds/worker-6/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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" "+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]  Downloading crates ...
[INFO] [stderr]   Downloaded peg v0.5.7
[INFO] [stderr]   Downloaded keccak v0.1.0
[INFO] [stderr]   Downloaded sha3 v0.7.3
[INFO] [stderr]   Downloaded futures-await-async-macro v0.1.4
[INFO] [stderr]   Downloaded futures-await v0.1.1
[INFO] [stderr]   Downloaded ntriple v0.1.1
[INFO] [stderr]   Downloaded im v9.0.0
[INFO] [stderr]   Downloaded proptest v0.5.1
[INFO] [stderr]   Downloaded futures-await-await-macro v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] ca26dabc04671a3a6f0b17a53107fa3b1a68367622da77a69eaf0d9f786d4087
[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" "ca26dabc04671a3a6f0b17a53107fa3b1a68367622da77a69eaf0d9f786d4087", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca26dabc04671a3a6f0b17a53107fa3b1a68367622da77a69eaf0d9f786d4087", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca26dabc04671a3a6f0b17a53107fa3b1a68367622da77a69eaf0d9f786d4087", kill_on_drop: false }`
[INFO] [stdout] ca26dabc04671a3a6f0b17a53107fa3b1a68367622da77a69eaf0d9f786d4087
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 042ef0471a54045e1d3418ffb6ea19db92739a18b4bb91a652e8874fd99bb8d4
[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" "042ef0471a54045e1d3418ffb6ea19db92739a18b4bb91a652e8874fd99bb8d4", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-await-await-macro v0.1.1
[INFO] [stderr]    Compiling peg v0.5.7
[INFO] [stderr]     Checking uuid v0.6.5
[INFO] [stderr]    Compiling im v9.0.0
[INFO] [stderr]     Checking sha3 v0.7.3
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking parking_lot v0.5.5
[INFO] [stderr]    Compiling ntriple v0.1.1
[INFO] [stderr]    Compiling futures-await-async-macro v0.1.4
[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/futures-await-async-macro-0.1.4/src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(proc_macro)]
[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 `futures-await-async-macro`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "042ef0471a54045e1d3418ffb6ea19db92739a18b4bb91a652e8874fd99bb8d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "042ef0471a54045e1d3418ffb6ea19db92739a18b4bb91a652e8874fd99bb8d4", kill_on_drop: false }`
[INFO] [stdout] 042ef0471a54045e1d3418ffb6ea19db92739a18b4bb91a652e8874fd99bb8d4