[INFO] cloning repository https://github.com/hello2dj/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hello2dj/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhello2dj%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhello2dj%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ce0d5883667b72104cdd70b2882319ddf6fdb47a
[INFO] documenting hello2dj/rust-practice 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%2Fhello2dj%2Frust-practice" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hello2dj/rust-practice 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/hello2dj/rust-practice
[INFO] finished tweaking git repo https://github.com/hello2dj/rust-practice
[INFO] tweaked toml for git repo https://github.com/hello2dj/rust-practice written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/hello2dj/rust-practice 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 94ba6fb3baf98c595845d08a360c46ae66363957307efb1463bd0d2a40a58b57
[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" "94ba6fb3baf98c595845d08a360c46ae66363957307efb1463bd0d2a40a58b57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94ba6fb3baf98c595845d08a360c46ae66363957307efb1463bd0d2a40a58b57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94ba6fb3baf98c595845d08a360c46ae66363957307efb1463bd0d2a40a58b57", kill_on_drop: false }`
[INFO] [stdout] 94ba6fb3baf98c595845d08a360c46ae66363957307efb1463bd0d2a40a58b57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 86be60ae5782ada45de497147f5cfcfe90cf8ca553dbd7de4e3c2f3d59f4f615
[INFO] running `Command { std: "docker" "start" "-a" "86be60ae5782ada45de497147f5cfcfe90cf8ca553dbd7de4e3c2f3d59f4f615", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]    Compiling num-bigint v0.2.1
[INFO] [stderr]    Compiling flate2-crc v0.1.1
[INFO] [stderr]     Checking bit-vec v0.5.0
[INFO] [stderr]     Checking bufstream v0.1.4
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking uuid v0.6.5
[INFO] [stderr]     Checking arrayvec v0.4.8
[INFO] [stderr]     Checking smallvec v0.6.6
[INFO] [stderr]     Checking tokio-current-thread v0.1.4
[INFO] [stderr]     Checking tokio-timer v0.2.8
[INFO] [stderr]     Checking proc-macro2 v0.4.27
[INFO] [stderr]     Checking atoi v0.2.3
[INFO] [stderr]     Checking checked v0.5.0
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]     Checking quote v0.6.11
[INFO] [stderr]     Checking crossbeam-epoch v0.6.1
[INFO] [stderr]     Checking crossbeam-deque v0.6.2
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking memchr v2.1.1
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking rand v0.6.1
[INFO] [stderr]     Checking miniz-sys v0.1.11
[INFO] [stderr]     Checking nix v0.11.0
[INFO] [stderr]     Checking flate2 v1.0.5
[INFO] [stderr]     Checking bytes v0.4.11
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking csv-core v0.1.5
[INFO] [stderr]     Checking tokio-io v0.1.10
[INFO] [stderr]     Checking csv v1.0.5
[INFO] [stderr]     Checking regex v1.0.6
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking parking_lot_core v0.3.1
[INFO] [stderr]     Checking twox-hash v1.1.1
[INFO] [stderr]     Checking tokio-threadpool v0.1.9
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking tokio-reactor v0.1.7
[INFO] [stderr]     Checking tokio-uds v0.2.4
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]     Checking tokio-udp v0.1.3
[INFO] [stderr]     Checking tokio-fs v0.1.4
[INFO] [stderr]     Checking mysql_common v0.9.2
[INFO] [stderr]     Checking tokio v0.1.13
[INFO] [stderr]    Compiling serde_derive v1.0.87
[INFO] [stderr]     Checking mysql v14.1.1
[INFO] [stderr]  Documenting future 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(trace_macros)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(dbg_macro)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![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 4 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 `future`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name future 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 csv=/opt/rustwide/target/debug/deps/libcsv-ce0c4d66501ff2a8.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-4186dd78dd1572d5.rmeta --extern mysql=/opt/rustwide/target/debug/deps/libmysql-c42dfe47d5cfc167.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-a1c4800818fdfb16.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-1e9c386023604d1d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-39725c527a66218d.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-d0068fd92550d932.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-4df705dc85c064f4.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-4f132bf83b17a501.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-d1b58dfe11c689e1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "86be60ae5782ada45de497147f5cfcfe90cf8ca553dbd7de4e3c2f3d59f4f615", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86be60ae5782ada45de497147f5cfcfe90cf8ca553dbd7de4e3c2f3d59f4f615", kill_on_drop: false }`
[INFO] [stdout] 86be60ae5782ada45de497147f5cfcfe90cf8ca553dbd7de4e3c2f3d59f4f615
