[INFO] cloning repository https://github.com/Lolirofle/simple_keyboard_instrument
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Lolirofle/simple_keyboard_instrument" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLolirofle%2Fsimple_keyboard_instrument", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLolirofle%2Fsimple_keyboard_instrument'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 780dbcc320985eb776e39f469b3e36336bdd6790
[INFO] documenting Lolirofle/simple_keyboard_instrument 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%2FLolirofle%2Fsimple_keyboard_instrument" "/workspace/builds/worker-36/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-36/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Lolirofle/simple_keyboard_instrument 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/Lolirofle/simple_keyboard_instrument
[INFO] finished tweaking git repo https://github.com/Lolirofle/simple_keyboard_instrument
[INFO] tweaked toml for git repo https://github.com/Lolirofle/simple_keyboard_instrument written to /workspace/builds/worker-36/source/Cargo.toml
[INFO] crate git repo https://github.com/Lolirofle/simple_keyboard_instrument 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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] 356d5b7f219e2622b4a06b2a11ce5d6ffc9e1196d81dc223f0972cba3d895c98
[INFO] running `Command { std: "docker" "start" "-a" "356d5b7f219e2622b4a06b2a11ce5d6ffc9e1196d81dc223f0972cba3d895c98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "356d5b7f219e2622b4a06b2a11ce5d6ffc9e1196d81dc223f0972cba3d895c98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "356d5b7f219e2622b4a06b2a11ce5d6ffc9e1196d81dc223f0972cba3d895c98", kill_on_drop: false }`
[INFO] [stdout] 356d5b7f219e2622b4a06b2a11ce5d6ffc9e1196d81dc223f0972cba3d895c98
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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] 54b8de8bb70afdb92fc13a59c1d6f6c6bf896e2ddadd139458eb353b7646045e
[INFO] running `Command { std: "docker" "start" "-a" "54b8de8bb70afdb92fc13a59c1d6f6c6bf896e2ddadd139458eb353b7646045e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.26
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling xml-rs v0.8.0
[INFO] [stderr]    Compiling nix v0.12.0
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking downcast-rs v1.0.3
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking xdg v2.2.0
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling alsa-sys v0.1.2
[INFO] [stderr]    Compiling x11-dl v2.18.3
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking approx v0.3.1
[INFO] [stderr]     Checking stb_truetype v0.2.5
[INFO] [stderr]     Checking ordered-float v1.0.1
[INFO] [stderr]     Checking line_drawing v0.7.0
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking owning_ref v0.4.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking walkdir v2.2.7
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.0
[INFO] [stderr]     Checking smallvec v0.6.8
[INFO] [stderr]     Checking rusttype v0.7.3
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking andrew v0.1.6
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling libloading v0.5.0
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]     Checking rand_os v0.1.1
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]    Compiling wayland-scanner v0.21.11
[INFO] [stderr]     Checking cpal v0.8.2
[INFO] [stderr]     Checking dlib v0.4.1
[INFO] [stderr]     Checking wayland-sys v0.21.11
[INFO] [stderr]    Compiling wayland-client v0.21.11
[INFO] [stderr]    Compiling wayland-protocols v0.21.11
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking wayland-commons v0.21.11
[INFO] [stderr]     Checking smithay-client-toolkit v0.4.4
[INFO] [stderr]     Checking winit v0.18.1
[INFO] [stderr]  Documenting keyboard_piano 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(type_ascription)]
[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 `keyboard_piano`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name keyboard_piano src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b2c9909512366475 -L dependency=/opt/rustwide/target/debug/deps --extern cpal=/opt/rustwide/target/debug/deps/libcpal-2b99d406423f3c78.rmeta --extern winit=/opt/rustwide/target/debug/deps/libwinit-8d3a8fc1ce9a2680.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "54b8de8bb70afdb92fc13a59c1d6f6c6bf896e2ddadd139458eb353b7646045e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54b8de8bb70afdb92fc13a59c1d6f6c6bf896e2ddadd139458eb353b7646045e", kill_on_drop: false }`
[INFO] [stdout] 54b8de8bb70afdb92fc13a59c1d6f6c6bf896e2ddadd139458eb353b7646045e