[INFO] fetching crate termcandy 0.1.0...
[INFO] documenting termcandy-0.1.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate termcandy 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate termcandy 0.1.0 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 crates.io crate termcandy 0.1.0
[INFO] finished tweaking crates.io crate termcandy 0.1.0
[INFO] tweaked toml for crates.io crate termcandy 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 360b979b2c5ee9e3c230a790e9863a3d7086c72b6b6f690eb49f4d2fdc369541
[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" "360b979b2c5ee9e3c230a790e9863a3d7086c72b6b6f690eb49f4d2fdc369541", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "360b979b2c5ee9e3c230a790e9863a3d7086c72b6b6f690eb49f4d2fdc369541", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "360b979b2c5ee9e3c230a790e9863a3d7086c72b6b6f690eb49f4d2fdc369541", kill_on_drop: false }`
[INFO] [stdout] 360b979b2c5ee9e3c230a790e9863a3d7086c72b6b6f690eb49f4d2fdc369541
[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" "+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] 814deaf1d9199c1919cbf417c5455f64d3acbbdf80231951fb5f4e737a4a2cd4
[INFO] running `Command { std: "docker" "start" "-a" "814deaf1d9199c1919cbf417c5455f64d3acbbdf80231951fb5f4e737a4a2cd4", kill_on_drop: false }`
[INFO] [stderr]    Compiling termcandy-macros v0.1.0
[INFO] [stderr]     Checking tokio-signal v0.2.9
[INFO] [stderr]  Documenting termcandy v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generators)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(generator_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 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 `termcandy`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name termcandy src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern failure=/opt/rustwide/target/debug/deps/libfailure-fa85c9e222265e84.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-2f80a151d70e23d0.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-72923b2d9aa06af7.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-0d4e59a692e831a5.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-4d9b6dc7228ae14f.rmeta --extern mio=/opt/rustwide/target/debug/deps/libmio-b5ccd54c90bb9b6d.rmeta --extern slab=/opt/rustwide/target/debug/deps/libslab-560a8b8f37310699.rmeta --extern termcandy_macros=/opt/rustwide/target/debug/deps/libtermcandy_macros-5c844d333cc455b6.so --extern termion=/opt/rustwide/target/debug/deps/libtermion-39588d9161868b28.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-79af430f5e4cf1ae.rmeta --extern tokio_signal=/opt/rustwide/target/debug/deps/libtokio_signal-b10272375b5db90d.rmeta --extern unicode_width=/opt/rustwide/target/debug/deps/libunicode_width-d42f8e98ea70ac76.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "814deaf1d9199c1919cbf417c5455f64d3acbbdf80231951fb5f4e737a4a2cd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "814deaf1d9199c1919cbf417c5455f64d3acbbdf80231951fb5f4e737a4a2cd4", kill_on_drop: false }`
[INFO] [stdout] 814deaf1d9199c1919cbf417c5455f64d3acbbdf80231951fb5f4e737a4a2cd4
