[INFO] cloning repository https://github.com/yuriks/advance-emu
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yuriks/advance-emu" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuriks%2Fadvance-emu", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuriks%2Fadvance-emu'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c8be83ee40c8d0f014bccb0d0351c652892b82f6
[INFO] documenting yuriks/advance-emu 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%2Fyuriks%2Fadvance-emu" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yuriks/advance-emu 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/yuriks/advance-emu
[INFO] finished tweaking git repo https://github.com/yuriks/advance-emu
[INFO] tweaked toml for git repo https://github.com/yuriks/advance-emu written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/yuriks/advance-emu 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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] 4a17dc127c2749dc7b35a1ef89bfef458ef727c70548c572fab28a3b627ae93e
[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" "4a17dc127c2749dc7b35a1ef89bfef458ef727c70548c572fab28a3b627ae93e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a17dc127c2749dc7b35a1ef89bfef458ef727c70548c572fab28a3b627ae93e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a17dc127c2749dc7b35a1ef89bfef458ef727c70548c572fab28a3b627ae93e", kill_on_drop: false }`
[INFO] [stdout] 4a17dc127c2749dc7b35a1ef89bfef458ef727c70548c572fab28a3b627ae93e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] e4e1988e12802bbcc1b6f7b76c4b1196fd8ea0ac33a79ac7d16410258ddef059
[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" "e4e1988e12802bbcc1b6f7b76c4b1196fd8ea0ac33a79ac7d16410258ddef059", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-complex v0.2.0
[INFO] [stderr]    Compiling sdl2-sys v0.31.0
[INFO] [stderr]     Checking num-bigint v0.2.0
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking num-rational v0.2.1
[INFO] [stderr]     Checking sdl2 v0.31.0
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]  Documenting advance v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     arbitrary_self_types,
[INFO] [stdout] 3 | |     generator_trait,
[INFO] [stdout] 4 | |     generators,
[INFO] [stdout] 5 | |     pin,
[INFO] [stdout] 6 | |     test
[INFO] [stdout] 7 | | )]
[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 `advance`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name advance src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=ca40047020a8a1ca -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-ff86b4ef8f3ef568.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-c5dffa32b19a5894.rmeta --extern sdl2=/opt/rustwide/target/debug/deps/libsdl2-23860bacb09441ff.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e4e1988e12802bbcc1b6f7b76c4b1196fd8ea0ac33a79ac7d16410258ddef059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4e1988e12802bbcc1b6f7b76c4b1196fd8ea0ac33a79ac7d16410258ddef059", kill_on_drop: false }`
[INFO] [stdout] e4e1988e12802bbcc1b6f7b76c4b1196fd8ea0ac33a79ac7d16410258ddef059