[INFO] cloning repository https://github.com/CoiledSpring/bf-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CoiledSpring/bf-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCoiledSpring%2Fbf-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCoiledSpring%2Fbf-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9d0af753220004349cffc1a1fbba9b2c6f2b32d1
[INFO] documenting CoiledSpring/bf-rs 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%2FCoiledSpring%2Fbf-rs" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CoiledSpring/bf-rs 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/CoiledSpring/bf-rs
[INFO] finished tweaking git repo https://github.com/CoiledSpring/bf-rs
[INFO] tweaked toml for git repo https://github.com/CoiledSpring/bf-rs written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/CoiledSpring/bf-rs 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 881a0a58ea1ec7bf45fd1d2ce2901f82320bc6705b87cb52fbeeb469d881e508
[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" "881a0a58ea1ec7bf45fd1d2ce2901f82320bc6705b87cb52fbeeb469d881e508", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "881a0a58ea1ec7bf45fd1d2ce2901f82320bc6705b87cb52fbeeb469d881e508", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "881a0a58ea1ec7bf45fd1d2ce2901f82320bc6705b87cb52fbeeb469d881e508", kill_on_drop: false }`
[INFO] [stdout] 881a0a58ea1ec7bf45fd1d2ce2901f82320bc6705b87cb52fbeeb469d881e508
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] c08e6da589f9050abf8ca0d508131ce7d3d4500ed815e707ca222ab725d2d71c
[INFO] running `Command { std: "docker" "start" "-a" "c08e6da589f9050abf8ca0d508131ce7d3d4500ed815e707ca222ab725d2d71c", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.2
[INFO] [stderr]     Checking libc v0.2.36
[INFO] [stderr]     Checking log v0.4.1
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking time v0.1.39
[INFO] [stderr]     Checking simplelog v0.4.4
[INFO] [stderr]  Documenting bf-rs 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:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(slice_patterns)]
[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 `bf-rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name bf_rs 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 libc=/opt/rustwide/target/debug/deps/liblibc-d5f3ba9fd3d8b680.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-426fac0b112610da.rmeta --extern simplelog=/opt/rustwide/target/debug/deps/libsimplelog-f6a524e619e6352e.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "c08e6da589f9050abf8ca0d508131ce7d3d4500ed815e707ca222ab725d2d71c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c08e6da589f9050abf8ca0d508131ce7d3d4500ed815e707ca222ab725d2d71c", kill_on_drop: false }`
[INFO] [stdout] c08e6da589f9050abf8ca0d508131ce7d3d4500ed815e707ca222ab725d2d71c