[INFO] cloning repository https://github.com/danielbartsch/Platformer2D-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danielbartsch/Platformer2D-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielbartsch%2FPlatformer2D-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielbartsch%2FPlatformer2D-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3e19a48374c6fb4a1ede6ad9d3484d4668d0bc46
[INFO] documenting danielbartsch/Platformer2D-rust against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielbartsch%2FPlatformer2D-rust" "/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/danielbartsch/Platformer2D-rust on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/danielbartsch/Platformer2D-rust
[INFO] finished tweaking git repo https://github.com/danielbartsch/Platformer2D-rust
[INFO] tweaked toml for git repo https://github.com/danielbartsch/Platformer2D-rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/danielbartsch/Platformer2D-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+beta-2022-05-20" "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] 84e15ac0a03448257554ce659b3c88e029c1db858f132582650fdde9c96ddf95
[INFO] running `Command { std: "docker" "start" "-a" "84e15ac0a03448257554ce659b3c88e029c1db858f132582650fdde9c96ddf95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "84e15ac0a03448257554ce659b3c88e029c1db858f132582650fdde9c96ddf95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84e15ac0a03448257554ce659b3c88e029c1db858f132582650fdde9c96ddf95", kill_on_drop: false }`
[INFO] [stdout] 84e15ac0a03448257554ce659b3c88e029c1db858f132582650fdde9c96ddf95
[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" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a5f4803509ce6aaf76f35f5d4529c85011d992454a80b004621d445602c113e
[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" "9a5f4803509ce6aaf76f35f5d4529c85011d992454a80b004621d445602c113e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling sdl2 v0.33.0
[INFO] [stderr]    Compiling sdl2-sys v0.33.0
[INFO] [stderr]     Checking serde_json v1.0.45
[INFO] [stderr]  Documenting platformer_2d 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 document `platformer_2d`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name platformer_2d src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=144f864c7c373a2d -L dependency=/opt/rustwide/target/debug/deps --extern sdl2=/opt/rustwide/target/debug/deps/libsdl2-b4aa6dbc3496632c.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-c87632dd0093dfa3.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-39b9fd50e01640e7.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9a5f4803509ce6aaf76f35f5d4529c85011d992454a80b004621d445602c113e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a5f4803509ce6aaf76f35f5d4529c85011d992454a80b004621d445602c113e", kill_on_drop: false }`
[INFO] [stdout] 9a5f4803509ce6aaf76f35f5d4529c85011d992454a80b004621d445602c113e