[INFO] cloning repository https://github.com/mgsloan/treadcam
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mgsloan/treadcam" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmgsloan%2Ftreadcam", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmgsloan%2Ftreadcam'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a7394173dbc9e81874d897e2e382f0ea38784b20
[INFO] documenting mgsloan/treadcam against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmgsloan%2Ftreadcam" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mgsloan/treadcam 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 git repo https://github.com/mgsloan/treadcam
[INFO] finished tweaking git repo https://github.com/mgsloan/treadcam
[INFO] tweaked toml for git repo https://github.com/mgsloan/treadcam written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/mgsloan/treadcam 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 num-integer v0.1.38
[INFO] [stderr]   Downloaded deflate v0.7.18
[INFO] [stderr]   Downloaded rustfft v2.0.0
[INFO] [stderr]   Downloaded image v0.17.0
[INFO] [stderr]   Downloaded goertzel v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stdout] 953acc82735a3dac0397f2125ba6ce78f7f5adc213607244ac35f5c381705969
[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" "953acc82735a3dac0397f2125ba6ce78f7f5adc213607244ac35f5c381705969", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "953acc82735a3dac0397f2125ba6ce78f7f5adc213607244ac35f5c381705969", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "953acc82735a3dac0397f2125ba6ce78f7f5adc213607244ac35f5c381705969", kill_on_drop: false }`
[INFO] [stdout] 953acc82735a3dac0397f2125ba6ce78f7f5adc213607244ac35f5c381705969
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2efc0c90046688a3e6e580b32aa69fb73bc38b2029f7154ac0024557463d4429
[INFO] running `Command { std: "docker" "start" "-a" "2efc0c90046688a3e6e580b32aa69fb73bc38b2029f7154ac0024557463d4429", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking lazy_static v1.0.1
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling serde v1.0.66
[INFO] [stderr]     Checking bitflags v1.0.3
[INFO] [stderr]     Checking goertzel v0.2.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.6
[INFO] [stderr]     Checking inflate v0.3.4
[INFO] [stderr]     Checking deflate v0.7.18
[INFO] [stderr]     Checking gif v0.9.2
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking rscam v0.5.4
[INFO] [stderr]    Compiling syn v0.14.2
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking rayon v1.0.1
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking png v0.11.0
[INFO] [stderr]     Checking rustfft v2.0.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling serde_derive v1.0.66
[INFO] [stderr]     Checking image v0.17.0
[INFO] [stderr]     Checking serde_json v1.0.20
[INFO] [stderr]  Documenting treadcam v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(type_ascription)]
[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 `treadcam`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name treadcam 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 goertzel=/opt/rustwide/target/debug/deps/libgoertzel-7658e223c71604be.rmeta --extern image=/opt/rustwide/target/debug/deps/libimage-c7434710e482c460.rmeta --extern rscam=/opt/rustwide/target/debug/deps/librscam-42b5c3f6041a46e5.rmeta --extern rustfft=/opt/rustwide/target/debug/deps/librustfft-85f82eb10c674093.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-61ef6393f7bc8f53.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-4cecb7a599a7b7f1.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-992c5c78e750ad6a.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "2efc0c90046688a3e6e580b32aa69fb73bc38b2029f7154ac0024557463d4429", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2efc0c90046688a3e6e580b32aa69fb73bc38b2029f7154ac0024557463d4429", kill_on_drop: false }`
[INFO] [stdout] 2efc0c90046688a3e6e580b32aa69fb73bc38b2029f7154ac0024557463d4429