[INFO] fetching crate futures-async-stream 0.2.2...
[INFO] documenting futures-async-stream-0.2.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate futures-async-stream 0.2.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate futures-async-stream 0.2.2 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 crates.io crate futures-async-stream 0.2.2
[INFO] finished tweaking crates.io crate futures-async-stream 0.2.2
[INFO] tweaked toml for crates.io crate futures-async-stream 0.2.2 written to /workspace/builds/worker-4/source/Cargo.toml
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded pin-project v0.4.23
[INFO] [stderr]   Downloaded futures-task v0.3.5
[INFO] [stderr]   Downloaded serde_json v1.0.57
[INFO] [stderr]   Downloaded futures-core v0.3.5
[INFO] [stderr]   Downloaded futures-async-stream-macro v0.2.2
[INFO] [stderr]   Downloaded pin-utils v0.1.0
[INFO] [stderr]   Downloaded winapi-util v0.1.5
[INFO] [stderr]   Downloaded toml v0.5.6
[INFO] [stderr]   Downloaded itoa v0.4.6
[INFO] [stderr]   Downloaded trybuild v1.0.33
[INFO] [stderr]   Downloaded pin-project-internal v0.4.23
[INFO] [stderr]   Downloaded serde_derive v1.0.115
[INFO] [stderr]   Downloaded glob v0.3.0
[INFO] [stderr]   Downloaded serde v1.0.115
[INFO] [stderr]   Downloaded termcolor v1.1.0
[INFO] [stderr]   Downloaded futures-util v0.3.5
[INFO] [stderr]   Downloaded ryu v1.0.5
[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" "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] e45debf4a14480b48e2d89e9f81978e2ddb83b42358d3dcc4717c6571bb96d59
[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" "e45debf4a14480b48e2d89e9f81978e2ddb83b42358d3dcc4717c6571bb96d59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e45debf4a14480b48e2d89e9f81978e2ddb83b42358d3dcc4717c6571bb96d59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e45debf4a14480b48e2d89e9f81978e2ddb83b42358d3dcc4717c6571bb96d59", kill_on_drop: false }`
[INFO] [stdout] e45debf4a14480b48e2d89e9f81978e2ddb83b42358d3dcc4717c6571bb96d59
[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" "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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 14782c8f05d4edfd06a9b6d92cff642a4dcb90f82475663ba76f7d67c65f1a69
[INFO] running `Command { std: "docker" "start" "-a" "14782c8f05d4edfd06a9b6d92cff642a4dcb90f82475663ba76f7d67c65f1a69", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling futures-async-stream-macro v0.2.2
[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-async-stream-macro-0.2.2/src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![feature(proc_macro_def_site)]
[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-async-stream-macro`.
[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" "14782c8f05d4edfd06a9b6d92cff642a4dcb90f82475663ba76f7d67c65f1a69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14782c8f05d4edfd06a9b6d92cff642a4dcb90f82475663ba76f7d67c65f1a69", kill_on_drop: false }`
[INFO] [stdout] 14782c8f05d4edfd06a9b6d92cff642a4dcb90f82475663ba76f7d67c65f1a69