[INFO] fetching crate snekdown 0.22.9...
[INFO] documenting snekdown-0.22.9 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate snekdown 0.22.9 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate snekdown 0.22.9 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 snekdown 0.22.9
[INFO] finished tweaking crates.io crate snekdown 0.22.9
[INFO] tweaked toml for crates.io crate snekdown 0.22.9 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate snekdown 0.22.9 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 asciimath-rs v0.5.6
[INFO] [stderr]   Downloaded minify v1.1.1
[INFO] [stderr]   Downloaded gh-emoji v1.0.3
[INFO] [stderr]   Downloaded charred v0.3.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 4228d916c96e1da4d8da40438037ca997d52be1b89cfac08ab98ad9a889d288e
[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" "4228d916c96e1da4d8da40438037ca997d52be1b89cfac08ab98ad9a889d288e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4228d916c96e1da4d8da40438037ca997d52be1b89cfac08ab98ad9a889d288e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4228d916c96e1da4d8da40438037ca997d52be1b89cfac08ab98ad9a889d288e", kill_on_drop: false }`
[INFO] [stdout] 4228d916c96e1da4d8da40438037ca997d52be1b89cfac08ab98ad9a889d288e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 60fc69787997c5a53f68ff512773891c3ea47144536a2ca986b7abdca8575880
[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" "60fc69787997c5a53f68ff512773891c3ea47144536a2ca986b7abdca8575880", kill_on_drop: false }`
[INFO] [stderr]     Checking charred v0.3.1
[INFO] [stderr]     Checking minify v1.1.1
[INFO] [stderr]     Checking tracing-core v0.1.13
[INFO] [stderr]     Checking line-wrap v0.1.1
[INFO] [stderr]    Compiling onig_sys v69.5.0
[INFO] [stderr]     Checking inotify-sys v0.1.3
[INFO] [stderr]     Checking filetime v0.2.12
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking gh-emoji v1.0.3
[INFO] [stderr]     Checking native-tls v0.2.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/charred-0.3.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rayon v1.3.1
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `charred`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "60fc69787997c5a53f68ff512773891c3ea47144536a2ca986b7abdca8575880", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60fc69787997c5a53f68ff512773891c3ea47144536a2ca986b7abdca8575880", kill_on_drop: false }`
[INFO] [stdout] 60fc69787997c5a53f68ff512773891c3ea47144536a2ca986b7abdca8575880