[INFO] fetching crate indexkv 0.6.0...
[INFO] documenting indexkv-0.6.0 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate indexkv 0.6.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate indexkv 0.6.0 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate indexkv 0.6.0
[INFO] finished tweaking crates.io crate indexkv 0.6.0
[INFO] tweaked toml for crates.io crate indexkv 0.6.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 55440929fe5cfe4fc529339c55c865bf4ff00dec9fe97440405d51fc2a18efef
[INFO] running `Command { std: "docker" "start" "-a" "55440929fe5cfe4fc529339c55c865bf4ff00dec9fe97440405d51fc2a18efef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "55440929fe5cfe4fc529339c55c865bf4ff00dec9fe97440405d51fc2a18efef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55440929fe5cfe4fc529339c55c865bf4ff00dec9fe97440405d51fc2a18efef", kill_on_drop: false }`
[INFO] [stdout] 55440929fe5cfe4fc529339c55c865bf4ff00dec9fe97440405d51fc2a18efef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91b93308507dd6b38317967db7d431f267169a620e4c6041ee3215ffe0a619c3
[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" "91b93308507dd6b38317967db7d431f267169a620e4c6041ee3215ffe0a619c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[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 futures-util v0.3.21
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking tracing-core v0.1.26
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.21
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]     Checking tokio v1.18.2
[INFO] [stderr]     Checking thiserror v1.0.31
[INFO] [stderr]     Checking tracing v0.1.34
[INFO] [stderr]     Checking tokio-byteorder v0.3.0
[INFO] [stderr]     Checking futures-executor v0.3.21
[INFO] [stderr]     Checking futures v0.3.21
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]  Documenting indexkv v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn_trait_bound)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_fn_trait_bound` has been stable since 1.61.0 and no longer requires an attribute to enable
[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 `indexkv`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name indexkv src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=7d3c679abf19167b -L dependency=/opt/rustwide/target/debug/deps --extern bincode=/opt/rustwide/target/debug/deps/libbincode-2bc6ff1e92f62c5b.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-21d0a7105b7fc30b.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-3ff2dcaec82f87b7.rmeta --extern fnv=/opt/rustwide/target/debug/deps/libfnv-dd37fcbf4810fcb5.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-cf0b7edb6cd3ec8d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-264a46616c40e5de.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-38257b06d8bdf695.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-751192ef9e6b6698.rmeta --extern tokio_byteorder=/opt/rustwide/target/debug/deps/libtokio_byteorder-8409f665951f3a9e.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-f6751c23a35b415c.rmeta --cap-lints=warn --crate-version 0.6.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "91b93308507dd6b38317967db7d431f267169a620e4c6041ee3215ffe0a619c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91b93308507dd6b38317967db7d431f267169a620e4c6041ee3215ffe0a619c3", kill_on_drop: false }`
[INFO] [stdout] 91b93308507dd6b38317967db7d431f267169a620e4c6041ee3215ffe0a619c3