[INFO] fetching crate tarpc-lib 0.7.0...
[INFO] documenting tarpc-lib-0.7.0 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate tarpc-lib 0.7.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate tarpc-lib 0.7.0 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 tarpc-lib 0.7.0
[INFO] finished tweaking crates.io crate tarpc-lib 0.7.0
[INFO] tweaked toml for crates.io crate tarpc-lib 0.7.0 written to /workspace/builds/worker-4/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stdout] 395a91cae2519f6039e29059fd90666316d82a95c7e4c9d4db2ebc6e05284c04
[INFO] running `Command { std: "docker" "start" "-a" "395a91cae2519f6039e29059fd90666316d82a95c7e4c9d4db2ebc6e05284c04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "395a91cae2519f6039e29059fd90666316d82a95c7e4c9d4db2ebc6e05284c04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "395a91cae2519f6039e29059fd90666316d82a95c7e4c9d4db2ebc6e05284c04", kill_on_drop: false }`
[INFO] [stdout] 395a91cae2519f6039e29059fd90666316d82a95c7e4c9d4db2ebc6e05284c04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] c3dfa86ddb968e4d665c02bad54b5abb58e59356381cc7e6d24d6480fde3593f
[INFO] running `Command { std: "docker" "start" "-a" "c3dfa86ddb968e4d665c02bad54b5abb58e59356381cc7e6d24d6480fde3593f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking tokio-executor v0.2.0-alpha.6
[INFO] [stderr]     Checking tokio-sync v0.2.0-alpha.6
[INFO] [stderr]     Checking tarpc-trace v0.3.0
[INFO] [stderr]     Checking tokio-timer v0.3.0-alpha.6
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.19
[INFO] [stderr]  Documenting tarpc-lib v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(weak_counts, non_exhaustive, trait_alias)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `non_exhaustive` has been stable since 1.40.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `tarpc-lib`
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name tarpc_lib 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=8138e42856d780be -L dependency=/opt/rustwide/target/debug/deps --extern fnv=/opt/rustwide/target/debug/deps/libfnv-dd37fcbf4810fcb5.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-8e745f64a5a20ec8.rmeta --extern humantime=/opt/rustwide/target/debug/deps/libhumantime-68e06aec7d9c945e.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-c2966570978c8032.rmeta --extern pin_utils=/opt/rustwide/target/debug/deps/libpin_utils-c17bf529103421a9.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-6da2383fa14d0272.rmeta --extern trace=/opt/rustwide/target/debug/deps/libtarpc_trace-5310fc3722682183.rmeta --extern tokio_timer=/opt/rustwide/target/debug/deps/libtokio_timer-f6eada59c2145600.rmeta --cap-lints=warn --crate-version 0.7.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "c3dfa86ddb968e4d665c02bad54b5abb58e59356381cc7e6d24d6480fde3593f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3dfa86ddb968e4d665c02bad54b5abb58e59356381cc7e6d24d6480fde3593f", kill_on_drop: false }`
[INFO] [stdout] c3dfa86ddb968e4d665c02bad54b5abb58e59356381cc7e6d24d6480fde3593f