[INFO] cloning repository https://github.com/Maan2003/lsp-keep-alive-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Maan2003/lsp-keep-alive-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMaan2003%2Flsp-keep-alive-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMaan2003%2Flsp-keep-alive-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 64247f2638d0aea1aa5dbc94bfb55f043bf07a78
[INFO] documenting Maan2003/lsp-keep-alive-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%2FMaan2003%2Flsp-keep-alive-rust" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Maan2003/lsp-keep-alive-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] started tweaking git repo https://github.com/Maan2003/lsp-keep-alive-rust
[INFO] finished tweaking git repo https://github.com/Maan2003/lsp-keep-alive-rust
[INFO] tweaked toml for git repo https://github.com/Maan2003/lsp-keep-alive-rust written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/Maan2003/lsp-keep-alive-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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lsp-types v0.93.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 6187b426bd3080cac0b74129a2e59c3892d02fcd459f36f17c3e6e6508477d45
[INFO] running `Command { std: "docker" "start" "-a" "6187b426bd3080cac0b74129a2e59c3892d02fcd459f36f17c3e6e6508477d45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6187b426bd3080cac0b74129a2e59c3892d02fcd459f36f17c3e6e6508477d45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6187b426bd3080cac0b74129a2e59c3892d02fcd459f36f17c3e6e6508477d45", kill_on_drop: false }`
[INFO] [stdout] 6187b426bd3080cac0b74129a2e59c3892d02fcd459f36f17c3e6e6508477d45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 8bce471026769454484ed2fdb5e9a5f9f2bcb6998478c707fc5058c0b6f1d1ee
[INFO] running `Command { std: "docker" "start" "-a" "8bce471026769454484ed2fdb5e9a5f9f2bcb6998478c707fc5058c0b6f1d1ee", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling syn v1.0.93
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]     Checking tracing-core v0.1.26
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking parking_lot_core v0.9.3
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]     Checking mio v0.8.3
[INFO] [stderr]     Checking tracing-log v0.1.3
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking parking_lot v0.12.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling tracing-attributes v0.1.21
[INFO] [stderr]    Compiling serde_repr v0.1.8
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]     Checking tokio v1.18.2
[INFO] [stderr]     Checking futures-util v0.3.21
[INFO] [stderr]     Checking tracing v0.1.34
[INFO] [stderr]     Checking tracing-subscriber v0.3.11
[INFO] [stderr]     Checking serde v1.0.137
[INFO] [stderr]     Checking futures-executor v0.3.21
[INFO] [stderr]     Checking futures v0.3.21
[INFO] [stderr]     Checking serde_json v1.0.81
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking lsp-types v0.93.0
[INFO] [stderr]  Documenting lsp-keep-alive-rust 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(let_else)]
[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 `lsp-keep-alive-rust`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name lsp_keep_alive_rust src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6a0df43c5fb6b8a6 -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-45e711f61c1a1077.rmeta --extern lsp_types=/opt/rustwide/target/debug/deps/liblsp_types-ec2d062efac48950.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-b10d63be5974d96c.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f08cac3380378019.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-d153359855880a69.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-57945360362c067a.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-c9337a059caffe4e.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8bce471026769454484ed2fdb5e9a5f9f2bcb6998478c707fc5058c0b6f1d1ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bce471026769454484ed2fdb5e9a5f9f2bcb6998478c707fc5058c0b6f1d1ee", kill_on_drop: false }`
[INFO] [stdout] 8bce471026769454484ed2fdb5e9a5f9f2bcb6998478c707fc5058c0b6f1d1ee