[INFO] fetching crate driverkit 0.16.0...
[INFO] documenting driverkit-0.16.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate driverkit 0.16.0 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate driverkit 0.16.0 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 driverkit 0.16.0
[INFO] finished tweaking crates.io crate driverkit 0.16.0
[INFO] tweaked toml for crates.io crate driverkit 0.16.0 written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate crates.io crate driverkit 0.16.0 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded raw-cpuid v10.3.0
[INFO] [stderr]   Downloaded phf_codegen v0.10.0
[INFO] [stderr]   Downloaded mmap v0.1.1
[INFO] [stderr]   Downloaded custom_error v1.9.2
[INFO] [stderr]   Downloaded x86 v0.47.0
[INFO] [stderr]   Downloaded openssl-src v111.18.0+1.1.1n
[INFO] [stderr]   Downloaded pciid-parser v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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] 5b7fe5a79bebf8dd26e01fdc2770e55f69c73cf46d7a04b63416bad5f0c05b4f
[INFO] running `Command { std: "docker" "start" "-a" "5b7fe5a79bebf8dd26e01fdc2770e55f69c73cf46d7a04b63416bad5f0c05b4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b7fe5a79bebf8dd26e01fdc2770e55f69c73cf46d7a04b63416bad5f0c05b4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b7fe5a79bebf8dd26e01fdc2770e55f69c73cf46d7a04b63416bad5f0c05b4f", kill_on_drop: false }`
[INFO] [stdout] 5b7fe5a79bebf8dd26e01fdc2770e55f69c73cf46d7a04b63416bad5f0c05b4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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] 1486af40e4f7bee8eb05f3642bff0eb27b07932a8e195ef17d743e6c8dccd867
[INFO] running `Command { std: "docker" "start" "-a" "1486af40e4f7bee8eb05f3642bff0eb27b07932a8e195ef17d743e6c8dccd867", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.124
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling log v0.4.16
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]    Compiling pin-project-lite v0.2.8
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling itoa v1.0.1
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling openssl v0.10.38
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling futures-sink v0.3.21
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling httparse v1.7.0
[INFO] [stderr]    Compiling slab v0.4.6
[INFO] [stderr]    Compiling once_cell v1.10.0
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling futures-io v0.3.21
[INFO] [stderr]    Compiling matches v0.1.9
[INFO] [stderr]    Compiling native-tls v0.2.10
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling try-lock v0.2.3
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling ryu v1.0.9
[INFO] [stderr]    Compiling openssl-probe v0.1.5
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling encoding_rs v0.8.31
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling tower-service v0.3.1
[INFO] [stderr]    Compiling unicode-bidi v0.3.7
[INFO] [stderr]    Compiling httpdate v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling siphasher v0.3.10
[INFO] [stderr]    Compiling ipnet v2.5.0
[INFO] [stderr]    Compiling humantime v2.1.0
[INFO] [stderr]    Compiling mime v0.3.16
[INFO] [stderr]    Compiling quick-error v2.0.1
[INFO] [stderr]    Compiling base64 v0.13.0
[INFO] [stderr]    Compiling termcolor v1.1.3
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling x86 v0.47.0
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]     Checking libc v0.1.12
[INFO] [stderr]     Checking custom_error v1.9.2
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling tracing-core v0.1.26
[INFO] [stderr]    Compiling foreign-types v0.3.2
[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/custom_error-1.9.2/src/lib.rs:3:43
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![cfg_attr(feature = "unstable", feature(allocator_api, try_reserve))]
[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/custom_error-1.9.2/src/lib.rs:3:58
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![cfg_attr(feature = "unstable", feature(allocator_api, try_reserve))]
[INFO] [stdout]   |                                                          ^^^^^^^^^^^
[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 compile `custom_error` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1486af40e4f7bee8eb05f3642bff0eb27b07932a8e195ef17d743e6c8dccd867", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1486af40e4f7bee8eb05f3642bff0eb27b07932a8e195ef17d743e6c8dccd867", kill_on_drop: false }`
[INFO] [stdout] 1486af40e4f7bee8eb05f3642bff0eb27b07932a8e195ef17d743e6c8dccd867