[INFO] fetching crate router-rs 0.2.1...
[INFO] documenting router-rs-0.2.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate router-rs 0.2.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate router-rs 0.2.1 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 crates.io crate router-rs 0.2.1
[INFO] finished tweaking crates.io crate router-rs 0.2.1
[INFO] tweaked toml for crates.io crate router-rs 0.2.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 router-rs-macro v0.1.1
[INFO] [stderr]   Downloaded html-macro v0.1.9
[INFO] [stderr]   Downloaded html-validation v0.1.2
[INFO] [stderr]   Downloaded virtual-node v0.2.7
[INFO] [stderr]   Downloaded virtual-dom-rs v0.6.14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7ed1f9ea71b15107b7dc795dc5bcc96972481c1297d8806ff9d57ab2354a75b6
[INFO] running `Command { std: "docker" "start" "-a" "7ed1f9ea71b15107b7dc795dc5bcc96972481c1297d8806ff9d57ab2354a75b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ed1f9ea71b15107b7dc795dc5bcc96972481c1297d8806ff9d57ab2354a75b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ed1f9ea71b15107b7dc795dc5bcc96972481c1297d8806ff9d57ab2354a75b6", kill_on_drop: false }`
[INFO] [stdout] 7ed1f9ea71b15107b7dc795dc5bcc96972481c1297d8806ff9d57ab2354a75b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 12ee7e74547fc5a2f6ac2afdda29c3910176dc71c89ac10be568f745705d54c6
[INFO] running `Command { std: "docker" "start" "-a" "12ee7e74547fc5a2f6ac2afdda29c3910176dc71c89ac10be568f745705d54c6", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling html-validation v0.1.2
[INFO] [stderr]     Checking wasm-bindgen v0.2.67
[INFO] [stderr]     Checking js-sys v0.3.44
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking web-sys v0.3.44
[INFO] [stderr]    Compiling html-macro v0.1.9
[INFO] [stderr]    Compiling router-rs-macro v0.1.1
[INFO] [stderr]     Checking virtual-node v0.2.7
[INFO] [stderr]     Checking virtual-dom-rs v0.6.14
[INFO] [stderr]  Documenting router-rs v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(proc_macro_hygiene)]
[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 `router-rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name router_rs 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 router_rs_macro=/opt/rustwide/target/debug/deps/librouter_rs_macro-a503663497bef3b0.so --extern virtual_dom_rs=/opt/rustwide/target/debug/deps/libvirtual_dom_rs-ec9f635f4e991c40.rmeta --cap-lints=warn --crate-version 0.2.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "12ee7e74547fc5a2f6ac2afdda29c3910176dc71c89ac10be568f745705d54c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12ee7e74547fc5a2f6ac2afdda29c3910176dc71c89ac10be568f745705d54c6", kill_on_drop: false }`
[INFO] [stdout] 12ee7e74547fc5a2f6ac2afdda29c3910176dc71c89ac10be568f745705d54c6