[INFO] cloning repository https://github.com/three-star-flex-book/bitdefender-rust-error-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/three-star-flex-book/bitdefender-rust-error-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthree-star-flex-book%2Fbitdefender-rust-error-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthree-star-flex-book%2Fbitdefender-rust-error-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a734b5973eb81a68e1c0e8fbab07b8e98e32efe2
[INFO] documenting three-star-flex-book/bitdefender-rust-error-example against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthree-star-flex-book%2Fbitdefender-rust-error-example" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/three-star-flex-book/bitdefender-rust-error-example on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/three-star-flex-book/bitdefender-rust-error-example
[INFO] finished tweaking git repo https://github.com/three-star-flex-book/bitdefender-rust-error-example
[INFO] tweaked toml for git repo https://github.com/three-star-flex-book/bitdefender-rust-error-example written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/three-star-flex-book/bitdefender-rust-error-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+1.46.0" "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] fd58d42a2f4105c8c86b5601c236d14bab929f3f055bd3aacc6735f8efccbe0c
[INFO] running `Command { std: "docker" "start" "-a" "fd58d42a2f4105c8c86b5601c236d14bab929f3f055bd3aacc6735f8efccbe0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd58d42a2f4105c8c86b5601c236d14bab929f3f055bd3aacc6735f8efccbe0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd58d42a2f4105c8c86b5601c236d14bab929f3f055bd3aacc6735f8efccbe0c", kill_on_drop: false }`
[INFO] [stdout] fd58d42a2f4105c8c86b5601c236d14bab929f3f055bd3aacc6735f8efccbe0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e8ae1c022e8d85f1b09159c7dd05a35f21373cbea267a56239dad509223d2ce4
[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" "e8ae1c022e8d85f1b09159c7dd05a35f21373cbea267a56239dad509223d2ce4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling memchr v2.3.0
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking ascii v0.9.3
[INFO] [stderr]     Checking http v0.2.0
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking serde_json v1.0.47
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking rand_chacha v0.2.1
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[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]     Checking headers-core v0.2.0
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]     Checking headers v0.3.1
[INFO] [stderr]     Checking tungstenite v0.9.2
[INFO] [stderr]     Checking multipart v0.16.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling tokio-macros v0.2.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]     Checking tokio v0.2.11
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking h2 v0.2.1
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking redis v0.15.1
[INFO] [stderr]     Checking hyper v0.13.2
[INFO] [stderr]     Checking warp v0.2.1
[INFO] [stderr]  Documenting warp-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_await)]
[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 `warp-example`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name warp_example src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-9b1deead1017473d.rmeta --extern redis=/opt/rustwide/target/debug/deps/libredis-3d8c54307b9ba0c5.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-3bc54a1af578a42a.rmeta --extern warp=/opt/rustwide/target/debug/deps/libwarp-4d4fe76f95a61a29.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e8ae1c022e8d85f1b09159c7dd05a35f21373cbea267a56239dad509223d2ce4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8ae1c022e8d85f1b09159c7dd05a35f21373cbea267a56239dad509223d2ce4", kill_on_drop: false }`
[INFO] [stdout] e8ae1c022e8d85f1b09159c7dd05a35f21373cbea267a56239dad509223d2ce4