[INFO] cloning repository https://github.com/hsharpsoftware/interop-fable-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hsharpsoftware/interop-fable-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsharpsoftware%2Finterop-fable-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsharpsoftware%2Finterop-fable-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98dead064043cd02a6fa6ee84e2072398030cad3
[INFO] documenting hsharpsoftware/interop-fable-rust 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%2Fhsharpsoftware%2Finterop-fable-rust" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hsharpsoftware/interop-fable-rust 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/hsharpsoftware/interop-fable-rust
[INFO] finished tweaking git repo https://github.com/hsharpsoftware/interop-fable-rust
[INFO] tweaked toml for git repo https://github.com/hsharpsoftware/interop-fable-rust written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/hsharpsoftware/interop-fable-rust 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_json v1.0.1
[INFO] [stderr]   Downloaded serde_derive_internals v0.15.0
[INFO] [stderr]   Downloaded serde_derive v1.0.2
[INFO] [stderr]   Downloaded serde v1.0.2
[INFO] [stderr]   Downloaded webplatform v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] c065893158eb0cd18949ae1cfbbbf98ee94168ac4f1bff669d1cb2abb6864ad7
[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" "c065893158eb0cd18949ae1cfbbbf98ee94168ac4f1bff669d1cb2abb6864ad7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c065893158eb0cd18949ae1cfbbbf98ee94168ac4f1bff669d1cb2abb6864ad7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c065893158eb0cd18949ae1cfbbbf98ee94168ac4f1bff669d1cb2abb6864ad7", kill_on_drop: false }`
[INFO] [stdout] c065893158eb0cd18949ae1cfbbbf98ee94168ac4f1bff669d1cb2abb6864ad7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stdout] fcdbfa1f084a5f3c571f676164c5581995f10cac6541a6186f33b0c6ec5b79e9
[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" "fcdbfa1f084a5f3c571f676164c5581995f10cac6541a6186f33b0c6ec5b79e9", kill_on_drop: false }`
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking serde v1.0.2
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]     Checking libc v0.2.22
[INFO] [stderr]     Checking num-traits v0.1.37
[INFO] [stderr]    Compiling serde_derive_internals v0.15.0
[INFO] [stderr]     Checking webplatform v0.4.2
[INFO] [stderr]    Compiling serde_derive v1.0.2
[INFO] [stderr]     Checking serde_json v1.0.1
[INFO] [stderr]  Documenting interop-fable-rust 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(libc)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(link_args)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `interop-fable-rust`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name interop_fable_rust 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 serde=/opt/rustwide/target/debug/deps/libserde-e1e637d6318b7766.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-8cb2436f6f9eabe0.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-535d97df38fb619a.rmeta --extern webplatform=/opt/rustwide/target/debug/deps/libwebplatform-bf430ff3a419d89d.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "fcdbfa1f084a5f3c571f676164c5581995f10cac6541a6186f33b0c6ec5b79e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcdbfa1f084a5f3c571f676164c5581995f10cac6541a6186f33b0c6ec5b79e9", kill_on_drop: false }`
[INFO] [stdout] fcdbfa1f084a5f3c571f676164c5581995f10cac6541a6186f33b0c6ec5b79e9