[INFO] fetching crate byml 0.1.4...
[INFO] documenting byml-0.1.4 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate byml 0.1.4 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate byml 0.1.4 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 byml 0.1.4
[INFO] finished tweaking crates.io crate byml 0.1.4
[INFO] tweaked toml for crates.io crate byml 0.1.4 written to /workspace/builds/worker-2/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] 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 binwrite_derive v0.2.1
[INFO] [stderr]   Downloaded binread_derive v1.4.3
[INFO] [stderr]   Downloaded parse_int v0.4.0
[INFO] [stderr]   Downloaded binread v1.4.1
[INFO] [stderr]   Downloaded binwrite v0.2.1
[INFO] [stderr]   Downloaded cached_proc_macro v0.4.0
[INFO] [stderr]   Downloaded yaz0 v0.1.2
[INFO] [stderr]   Downloaded cached v0.20.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] de55f796d19500bc9253d469458f45911c9b4bc01c5fba0a8d50a0e587df97fe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "de55f796d19500bc9253d469458f45911c9b4bc01c5fba0a8d50a0e587df97fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de55f796d19500bc9253d469458f45911c9b4bc01c5fba0a8d50a0e587df97fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de55f796d19500bc9253d469458f45911c9b4bc01c5fba0a8d50a0e587df97fe", kill_on_drop: false }`
[INFO] [stdout] de55f796d19500bc9253d469458f45911c9b4bc01c5fba0a8d50a0e587df97fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] cf153c224c1b8d6f5a046555563775b1726db9138d7d55327439b42962824f4b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cf153c224c1b8d6f5a046555563775b1726db9138d7d55327439b42962824f4b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking futures-sink v0.3.21
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]    Compiling async-trait v0.1.53
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling event-listener v2.5.2
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]    Compiling async-mutex v1.4.0
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling indexmap v1.8.2
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]     Checking yaz0 v0.1.2
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking parse_int v0.4.0
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling binwrite_derive v0.2.1
[INFO] [stderr]    Compiling binread_derive v1.4.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]     Checking binwrite v0.2.1
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling cached_proc_macro v0.4.0
[INFO] [stderr]     Checking thiserror v1.0.31
[INFO] [stderr]     Checking binread v1.4.1
[INFO] [stderr]     Checking futures-executor v0.3.21
[INFO] [stderr]     Checking futures v0.3.21
[INFO] [stderr]     Checking cached v0.20.0
[INFO] [stderr]  Documenting byml v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(seek_convenience)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `byml`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name byml src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=fe263d90e3bc0cd9 -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-17ec5adbf323ad47.rmeta --extern binread=/opt/rustwide/target/debug/deps/libbinread-e9963cc6463b6cae.rmeta --extern binwrite=/opt/rustwide/target/debug/deps/libbinwrite-33f721bb45ab5075.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-7c274f399d426ec2.rmeta --extern cached=/opt/rustwide/target/debug/deps/libcached-b25f9b148404b3fa.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-199f1906b378ba5f.rmeta --extern parse_int=/opt/rustwide/target/debug/deps/libparse_int-3077c66355a6b7fa.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-6ff852cd68f4dcba.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-ab62e5436bc5e57b.rmeta --extern yaz0=/opt/rustwide/target/debug/deps/libyaz0-d4b618cf29b8fa07.rmeta --cap-lints=warn --crate-version 0.1.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "cf153c224c1b8d6f5a046555563775b1726db9138d7d55327439b42962824f4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf153c224c1b8d6f5a046555563775b1726db9138d7d55327439b42962824f4b", kill_on_drop: false }`
[INFO] [stdout] cf153c224c1b8d6f5a046555563775b1726db9138d7d55327439b42962824f4b