[INFO] cloning repository https://github.com/jechase/rlox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jechase/rlox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjechase%2Frlox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjechase%2Frlox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 230eb638a84406f9de10f057b182bc3baa465242
[INFO] documenting jechase/rlox against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjechase%2Frlox" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jechase/rlox on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jechase/rlox
[INFO] finished tweaking git repo https://github.com/jechase/rlox
[INFO] tweaked toml for git repo https://github.com/jechase/rlox written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/jechase/rlox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded display_derive v0.0.0
[INFO] [stderr]   Downloaded cc v1.0.23
[INFO] [stderr]   Downloaded proc-macro2 v0.4.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 4bccf13b045ea1e31d53444401448cbe1854f1454a7360d3f8901c0fba37b9a9
[INFO] running `Command { std: "docker" "start" "-a" "4bccf13b045ea1e31d53444401448cbe1854f1454a7360d3f8901c0fba37b9a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4bccf13b045ea1e31d53444401448cbe1854f1454a7360d3f8901c0fba37b9a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bccf13b045ea1e31d53444401448cbe1854f1454a7360d3f8901c0fba37b9a9", kill_on_drop: false }`
[INFO] [stdout] 4bccf13b045ea1e31d53444401448cbe1854f1454a7360d3f8901c0fba37b9a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 668e6c794dac53e9debf3c88aefd6605f32905c99197ea0d333afc8e16042f36
[INFO] running `Command { std: "docker" "start" "-a" "668e6c794dac53e9debf3c88aefd6605f32905c99197ea0d333afc8e16042f36", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.18
[INFO] [stderr]    Compiling cc v1.0.23
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]     Checking rustc-demangle v0.1.9
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]     Checking utf-8 v0.7.4
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]     Checking new_debug_unreachable v1.0.1
[INFO] [stderr]     Checking futf v0.1.4
[INFO] [stderr]    Compiling display_derive v0.0.0
[INFO] [stderr]     Checking tendril v0.4.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking backtrace v0.3.9
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]     Checking failure v0.1.2
[INFO] [stderr]  Documenting rlox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(nll)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(transpose_result)]
[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 `rlox`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name rlox src/lib/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=84a0cd7871457331 -L dependency=/opt/rustwide/target/debug/deps --extern display_derive=/opt/rustwide/target/debug/deps/libdisplay_derive-bc49cc8c7e8d8c3f.so --extern either=/opt/rustwide/target/debug/deps/libeither-3e5dc6470e503f86.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-7a40e016d881170a.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-2e884fbb6de0e5de.rmeta --extern tendril=/opt/rustwide/target/debug/deps/libtendril-8edb59ce50841433.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "668e6c794dac53e9debf3c88aefd6605f32905c99197ea0d333afc8e16042f36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "668e6c794dac53e9debf3c88aefd6605f32905c99197ea0d333afc8e16042f36", kill_on_drop: false }`
[INFO] [stdout] 668e6c794dac53e9debf3c88aefd6605f32905c99197ea0d333afc8e16042f36