[INFO] cloning repository https://github.com/mickvangelderen/x11-lab
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mickvangelderen/x11-lab" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmickvangelderen%2Fx11-lab", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmickvangelderen%2Fx11-lab'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca9dec5430223ea377d860a2208b24f60bce4577
[INFO] documenting mickvangelderen/x11-lab 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%2Fmickvangelderen%2Fx11-lab" "/workspace/builds/worker-38/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-38/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mickvangelderen/x11-lab 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/mickvangelderen/x11-lab
[INFO] finished tweaking git repo https://github.com/mickvangelderen/x11-lab
[INFO] tweaked toml for git repo https://github.com/mickvangelderen/x11-lab written to /workspace/builds/worker-38/source/Cargo.toml
[INFO] crate git repo https://github.com/mickvangelderen/x11-lab 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]     Updating git repository `https://github.com/mickvangelderen/static-cstr`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.46
[INFO] [stderr]   Downloaded syn v0.15.24
[INFO] [stderr]   Downloaded x11 v2.18.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] a7e487eb4c4d9e19053542e9215ad7f9ad878635dce7dc78dc164663879cc79f
[INFO] running `Command { std: "docker" "start" "-a" "a7e487eb4c4d9e19053542e9215ad7f9ad878635dce7dc78dc164663879cc79f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7e487eb4c4d9e19053542e9215ad7f9ad878635dce7dc78dc164663879cc79f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7e487eb4c4d9e19053542e9215ad7f9ad878635dce7dc78dc164663879cc79f", kill_on_drop: false }`
[INFO] [stdout] a7e487eb4c4d9e19053542e9215ad7f9ad878635dce7dc78dc164663879cc79f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] 91dea11a52f8deed527db10d2c33f6c965a6493bd7d3b64fccdb300e2955dddc
[INFO] running `Command { std: "docker" "start" "-a" "91dea11a52f8deed527db10d2c33f6c965a6493bd7d3b64fccdb300e2955dddc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling libc v0.2.46
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling syn v0.15.24
[INFO] [stderr]    Compiling static-cstr v0.1.0 (https://github.com/mickvangelderen/static-cstr?branch=0.1.x#48e362a1)
[INFO] [stderr]  Documenting x11-lab 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(proc_macro_hygiene)]
[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 `x11-lab`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name x11_lab src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b3a73ec6033e744c -L dependency=/opt/rustwide/target/debug/deps --extern static_cstr=/opt/rustwide/target/debug/deps/libstatic_cstr-2cfe0ff60ca8a49d.so --extern x11=/opt/rustwide/target/debug/deps/libx11-d76ba5efaef69f58.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "91dea11a52f8deed527db10d2c33f6c965a6493bd7d3b64fccdb300e2955dddc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91dea11a52f8deed527db10d2c33f6c965a6493bd7d3b64fccdb300e2955dddc", kill_on_drop: false }`
[INFO] [stdout] 91dea11a52f8deed527db10d2c33f6c965a6493bd7d3b64fccdb300e2955dddc