[INFO] cloning repository https://github.com/myuon/rustapp-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/myuon/rustapp-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyuon%2Frustapp-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyuon%2Frustapp-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 924184f767a47b0a7b16c1a76af7963ef5c898b9
[INFO] documenting myuon/rustapp-example against 1.47.0 for beta-1.48-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmyuon%2Frustapp-example" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/myuon/rustapp-example on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/myuon/rustapp-example
[INFO] finished tweaking git repo https://github.com/myuon/rustapp-example
[INFO] tweaked toml for git repo https://github.com/myuon/rustapp-example written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/myuon/rustapp-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "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-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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d23e57ffafd6db3bcda18be522fb667fc05a8dbe823a0d167f6c37314cfa0811
[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" "d23e57ffafd6db3bcda18be522fb667fc05a8dbe823a0d167f6c37314cfa0811", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d23e57ffafd6db3bcda18be522fb667fc05a8dbe823a0d167f6c37314cfa0811", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d23e57ffafd6db3bcda18be522fb667fc05a8dbe823a0d167f6c37314cfa0811", kill_on_drop: false }`
[INFO] [stdout] d23e57ffafd6db3bcda18be522fb667fc05a8dbe823a0d167f6c37314cfa0811
[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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 810dbd3315522f1263adac4fe9e8b948e592c1c66a1a2f960dedc8f0cdd4c06c
[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" "810dbd3315522f1263adac4fe9e8b948e592c1c66a1a2f960dedc8f0cdd4c06c", 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 libc v0.2.62
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
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[INFO] [stderr]     Checking bit-vec v0.6.1
[INFO] [stderr]    Compiling mysql v16.1.0
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[INFO] [stderr]    Compiling num-iter v0.1.39
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[INFO] [stderr]     Checking futures01 v0.1.29
[INFO] [stderr]    Compiling mysqlclient-sys v0.2.4
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[INFO] [stderr]    Compiling enum-as-inner v0.2.1
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[INFO] [stderr]    Compiling diesel_derives v1.4.0
[INFO] [stderr]    Compiling derive_more v0.14.1
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[INFO] [stderr]     Checking rust_decimal v1.0.3
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[INFO] [stderr]     Checking actix-http v0.2.10
[INFO] [stderr]     Checking mysql_common v0.18.0
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[INFO] [stderr]     Checking actix-web v1.0.8
[INFO] [stderr]     Checking r2d2_mysql v16.0.0
[INFO] [stderr]  Documenting rustapp-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_closure)]
[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 `rustapp-example`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rustapp_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 actix=/opt/rustwide/target/debug/deps/libactix-eb11ced87d922f47.rmeta --extern actix_http=/opt/rustwide/target/debug/deps/libactix_http-7b494f361a490436.rmeta --extern actix_service=/opt/rustwide/target/debug/deps/libactix_service-508859a2f44bddfe.rmeta --extern actix_web=/opt/rustwide/target/debug/deps/libactix_web-8446295378df46db.rmeta --extern async_trait=/opt/rustwide/target/debug/deps/libasync_trait-6227669a6a9c4aac.so --extern bcrypt=/opt/rustwide/target/debug/deps/libbcrypt-e9b59fef1f6b9292.rmeta --extern biscuit=/opt/rustwide/target/debug/deps/libbiscuit-301d7a737b3fabcf.rmeta --extern diesel=/opt/rustwide/target/debug/deps/libdiesel-004aedfa0a991eea.rmeta --extern dotenv=/opt/rustwide/target/debug/deps/libdotenv-70c65c64522f7ea0.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-c63c41cc18ad02c8.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-6b9bf89247fbe0c7.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-9767e1a2f8c9b8bc.rmeta --extern futures01=/opt/rustwide/target/debug/deps/libfutures01-73aa7fee97071c0b.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-1b53669f640bf8d7.rmeta --extern mysql=/opt/rustwide/target/debug/deps/libmysql-7b7f831747839a2a.rmeta --extern r2d2=/opt/rustwide/target/debug/deps/libr2d2-1de43d250849681b.rmeta --extern r2d2_mysql=/opt/rustwide/target/debug/deps/libr2d2_mysql-9b94c8d5b86a01e3.rmeta --extern ring=/opt/rustwide/target/debug/deps/libring-60ff992df180a5e9.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-b66479022967387b.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-26266fa78975e50d.rmeta --extern ulid=/opt/rustwide/target/debug/deps/libulid-189397f076e04ea8.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "810dbd3315522f1263adac4fe9e8b948e592c1c66a1a2f960dedc8f0cdd4c06c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "810dbd3315522f1263adac4fe9e8b948e592c1c66a1a2f960dedc8f0cdd4c06c", kill_on_drop: false }`
[INFO] [stdout] 810dbd3315522f1263adac4fe9e8b948e592c1c66a1a2f960dedc8f0cdd4c06c
