[INFO] cloning repository https://github.com/KyleU/solitaire
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KyleU/solitaire" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKyleU%2Fsolitaire", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKyleU%2Fsolitaire'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca487942ca6402cf3ea922a8432dc9b20b7d42aa
[INFO] documenting KyleU/solitaire against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKyleU%2Fsolitaire" "/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/KyleU/solitaire on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/KyleU/solitaire
[INFO] finished tweaking git repo https://github.com/KyleU/solitaire
[INFO] tweaked toml for git repo https://github.com/KyleU/solitaire written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/KyleU/solitaire already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "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] bbe0e4b9493853428a864d42912135f994df5874cb4f544e58b8da526c9364a9
[INFO] running `Command { std: "docker" "start" "-a" "bbe0e4b9493853428a864d42912135f994df5874cb4f544e58b8da526c9364a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbe0e4b9493853428a864d42912135f994df5874cb4f544e58b8da526c9364a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbe0e4b9493853428a864d42912135f994df5874cb4f544e58b8da526c9364a9", kill_on_drop: false }`
[INFO] [stdout] bbe0e4b9493853428a864d42912135f994df5874cb4f544e58b8da526c9364a9
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "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] 2bf61c9fa26d387b25aa6962df7ba86f4dc662f3cb8b463f37f534a3c93780e7
[INFO] running `Command { std: "docker" "start" "-a" "2bf61c9fa26d387b25aa6962df7ba86f4dc662f3cb8b463f37f534a3c93780e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking bytes v0.5.3
[INFO] [stderr]     Checking pin-project-lite v0.1.2
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]     Checking copyless v0.1.4
[INFO] [stderr]    Compiling smallvec v1.0.0
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking untrusted v0.7.0
[INFO] [stderr]    Compiling anyhow v1.0.26
[INFO] [stderr]    Compiling shellexpand v1.0.0
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking lru-cache v0.1.2
[INFO] [stderr]     Checking app_dirs2 v2.0.4
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling rust-embed-utils v5.0.0
[INFO] [stderr]     Checking parking_lot_core v0.7.0
[INFO] [stderr]     Checking socket2 v0.3.11
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]    Compiling unicode-normalization v0.1.11
[INFO] [stderr]     Checking http v0.2.0
[INFO] [stderr]     Checking bytestring v0.1.2
[INFO] [stderr]     Checking crossbeam-channel v0.4.0
[INFO] [stderr]     Checking resolv-conf v0.6.2
[INFO] [stderr]    Compiling maud_macros v0.21.0
[INFO] [stderr]     Checking tokio v0.2.6
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]     Checking clap v2.33.0
[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/maud_macros-0.21.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_def_site)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_quote)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/maud_macros-0.21.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(proc_macro_span)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking term v0.6.1
[INFO] [stdout] error: aborting due to 5 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 compile `maud_macros`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2bf61c9fa26d387b25aa6962df7ba86f4dc662f3cb8b463f37f534a3c93780e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bf61c9fa26d387b25aa6962df7ba86f4dc662f3cb8b463f37f534a3c93780e7", kill_on_drop: false }`
[INFO] [stdout] 2bf61c9fa26d387b25aa6962df7ba86f4dc662f3cb8b463f37f534a3c93780e7
