[INFO] cloning repository https://github.com/sk-spr/playground_os_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sk-spr/playground_os_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsk-spr%2Fplayground_os_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsk-spr%2Fplayground_os_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6379acf9375be26526bb36beba1f8919e36708ea
[INFO] documenting sk-spr/playground_os_rust 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%2Fsk-spr%2Fplayground_os_rust" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sk-spr/playground_os_rust 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] removed /workspace/builds/worker-2/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/sk-spr/playground_os_rust
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/sk-spr/playground_os_rust
[INFO] tweaked toml for git repo https://github.com/sk-spr/playground_os_rust written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/sk-spr/playground_os_rust 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 4679ce9b272c2bf89aabeaa542aa6716c648d2a858630a78094aacf7d9ab7caf
[INFO] running `Command { std: "docker" "start" "-a" "4679ce9b272c2bf89aabeaa542aa6716c648d2a858630a78094aacf7d9ab7caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4679ce9b272c2bf89aabeaa542aa6716c648d2a858630a78094aacf7d9ab7caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4679ce9b272c2bf89aabeaa542aa6716c648d2a858630a78094aacf7d9ab7caf", kill_on_drop: false }`
[INFO] [stdout] 4679ce9b272c2bf89aabeaa542aa6716c648d2a858630a78094aacf7d9ab7caf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] f20d646537a9c450c20d1856fb2e56c59632988940defab86cfab56952be2f04
[INFO] running `Command { std: "docker" "start" "-a" "f20d646537a9c450c20d1856fb2e56c59632988940defab86cfab56952be2f04", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86_64 v0.14.8
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]     Checking volatile v0.4.4
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling bootloader v0.9.22
[INFO] [stderr]     Checking conquer-util v0.2.0
[INFO] [stderr]     Checking volatile v0.2.7
[INFO] [stderr]     Checking pc-keyboard v0.5.1
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking lock_api v0.4.6
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.4.6/src/lib.rs:93:34
[INFO] [stdout]    |
[INFO] [stdout] 93 | #![cfg_attr(feature = "nightly", feature(const_fn_trait_bound))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `const_fn_trait_bound` has been stable since 1.61.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking conquer-once v0.2.1
[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 `lock_api` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "f20d646537a9c450c20d1856fb2e56c59632988940defab86cfab56952be2f04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f20d646537a9c450c20d1856fb2e56c59632988940defab86cfab56952be2f04", kill_on_drop: false }`
[INFO] [stdout] f20d646537a9c450c20d1856fb2e56c59632988940defab86cfab56952be2f04