[INFO] fetching crate streaming-platform 0.1.0...
[INFO] documenting streaming-platform-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate streaming-platform 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate streaming-platform 0.1.0 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 streaming-platform 0.1.0
[INFO] finished tweaking crates.io crate streaming-platform 0.1.0
[INFO] tweaked toml for crates.io crate streaming-platform 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate streaming-platform 0.1.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded sp-dto v0.1.0
[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" "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] 10ae58a09294977a56dc2de46ce43b93f6593ac9d620996e64ee5ec0e7aff898
[INFO] running `Command { std: "docker" "start" "-a" "10ae58a09294977a56dc2de46ce43b93f6593ac9d620996e64ee5ec0e7aff898", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10ae58a09294977a56dc2de46ce43b93f6593ac9d620996e64ee5ec0e7aff898", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10ae58a09294977a56dc2de46ce43b93f6593ac9d620996e64ee5ec0e7aff898", kill_on_drop: false }`
[INFO] [stdout] 10ae58a09294977a56dc2de46ce43b93f6593ac9d620996e64ee5ec0e7aff898
[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" "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] f254b8a1b54f08eb7f6e79c1399e97ca58e92ecfbbafd701004f6f53fe52013e
[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" "f254b8a1b54f08eb7f6e79c1399e97ca58e92ecfbbafd701004f6f53fe52013e", 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]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking sp-dto v0.1.0
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]  Documenting streaming-platform v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `streaming-platform`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name streaming_platform src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-c5714e68d7e46dbf.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-d80566f366d7b55b.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-95a9d57e67df36ac.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-e7abca606876fd54.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-04c9aca728f0211b.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-dcce1d844f926d33.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-d57628d2fccd617d.rmeta --extern siphasher=/opt/rustwide/target/debug/deps/libsiphasher-c914f8efb07532b6.rmeta --extern sp_dto=/opt/rustwide/target/debug/deps/libsp_dto-7d7cf164e7e1e632.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-8e4a30f24db83dda.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-97b53231d8b9754d.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "f254b8a1b54f08eb7f6e79c1399e97ca58e92ecfbbafd701004f6f53fe52013e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f254b8a1b54f08eb7f6e79c1399e97ca58e92ecfbbafd701004f6f53fe52013e", kill_on_drop: false }`
[INFO] [stdout] f254b8a1b54f08eb7f6e79c1399e97ca58e92ecfbbafd701004f6f53fe52013e