[INFO] fetching crate cheddar 0.2.1...
[INFO] documenting cheddar-0.2.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate cheddar 0.2.1 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate cheddar 0.2.1 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 crates.io crate cheddar 0.2.1
[INFO] finished tweaking crates.io crate cheddar 0.2.1
[INFO] tweaked toml for crates.io crate cheddar 0.2.1 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nom v3.2.1
[INFO] [stderr]   Downloaded glsl v0.9.2
[INFO] [stderr]   Downloaded any-cache v0.2.3
[INFO] [stderr]   Downloaded warmy v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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] dd6a1d7eb914659d1751c103d4ae4de2cc60ac111797de8a680b39b8da712437
[INFO] running `Command { std: "docker" "start" "-a" "dd6a1d7eb914659d1751c103d4ae4de2cc60ac111797de8a680b39b8da712437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd6a1d7eb914659d1751c103d4ae4de2cc60ac111797de8a680b39b8da712437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd6a1d7eb914659d1751c103d4ae4de2cc60ac111797de8a680b39b8da712437", kill_on_drop: false }`
[INFO] [stdout] dd6a1d7eb914659d1751c103d4ae4de2cc60ac111797de8a680b39b8da712437
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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] a2de889fc551bf1d29c99af88f2513558abf0ccc7eac9043319c5e2f4d88b549
[INFO] running `Command { std: "docker" "start" "-a" "a2de889fc551bf1d29c99af88f2513558abf0ccc7eac9043319c5e2f4d88b549", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking lazycell v1.3.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking any-cache v0.2.3
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking net2 v0.2.37
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking inotify-sys v0.1.5
[INFO] [stderr]     Checking filetime v0.2.16
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking inotify v0.7.1
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking glsl v0.9.2
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]     Checking warmy v0.10.0
[INFO] [stderr]  Documenting cheddar v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:257:1
[INFO] [stdout]     |
[INFO] [stdout] 257 | #![feature(box_syntax)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:258:1
[INFO] [stdout]     |
[INFO] [stdout] 258 | #![feature(box_patterns)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `cheddar`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name cheddar src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=ca7dbf171a18ced5 -L dependency=/opt/rustwide/target/debug/deps --extern glsl=/opt/rustwide/target/debug/deps/libglsl-85fc4da8df3d9dd1.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-bb153aed95f65c5a.rmeta --extern warmy=/opt/rustwide/target/debug/deps/libwarmy-e3feddd672aaf0db.rmeta --cap-lints=warn --crate-version 0.2.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a2de889fc551bf1d29c99af88f2513558abf0ccc7eac9043319c5e2f4d88b549", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2de889fc551bf1d29c99af88f2513558abf0ccc7eac9043319c5e2f4d88b549", kill_on_drop: false }`
[INFO] [stdout] a2de889fc551bf1d29c99af88f2513558abf0ccc7eac9043319c5e2f4d88b549