[INFO] cloning repository https://github.com/iyuroch/rust_word_counter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iyuroch/rust_word_counter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiyuroch%2Frust_word_counter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiyuroch%2Frust_word_counter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 12ee883c7ff016ca88ac16f4d8e9fc7a7682612c
[INFO] documenting iyuroch/rust_word_counter against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiyuroch%2Frust_word_counter" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iyuroch/rust_word_counter 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 git repo https://github.com/iyuroch/rust_word_counter
[INFO] finished tweaking git repo https://github.com/iyuroch/rust_word_counter
[INFO] tweaked toml for git repo https://github.com/iyuroch/rust_word_counter written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/iyuroch/rust_word_counter already has a lockfile, it will not be regenerated
[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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 386da3835739d590942b636028ed84b690ae93103b0871ac19ca61d8f0657e71
[INFO] running `Command { std: "docker" "start" "-a" "386da3835739d590942b636028ed84b690ae93103b0871ac19ca61d8f0657e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "386da3835739d590942b636028ed84b690ae93103b0871ac19ca61d8f0657e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "386da3835739d590942b636028ed84b690ae93103b0871ac19ca61d8f0657e71", kill_on_drop: false }`
[INFO] [stdout] 386da3835739d590942b636028ed84b690ae93103b0871ac19ca61d8f0657e71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] afa438554054f8b49e0f58af077de29d556c2176988de98ba86d4ec6653180f1
[INFO] running `Command { std: "docker" "start" "-a" "afa438554054f8b49e0f58af077de29d556c2176988de98ba86d4ec6653180f1", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]     Checking lazy_static v1.0.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking stable_deref_trait v1.1.0
[INFO] [stderr]     Checking smallvec v0.6.2
[INFO] [stderr]    Compiling serde v1.0.66
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking crossbeam-utils v0.4.1
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking itoa v0.4.1
[INFO] [stderr]     Checking dtoa v0.4.2
[INFO] [stderr]     Checking spmc v0.2.2
[INFO] [stderr]     Checking crossbeam v0.3.2
[INFO] [stderr]     Checking canal v0.1.3
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking owning_ref v0.3.3
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]    Compiling proc-macro2 v0.4.6
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.5.0
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]    Compiling syn v0.14.2
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking chan v0.1.21
[INFO] [stderr]     Checking parking_lot v0.5.5
[INFO] [stderr]     Checking rayon v1.0.1
[INFO] [stderr]     Checking crossbeam-channel v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.66
[INFO] [stderr]     Checking serde_json v1.0.20
[INFO] [stderr]  Documenting word_counter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io)]
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `word_counter`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name word_counter src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=707376ec495a09c6 -L dependency=/opt/rustwide/target/debug/deps --extern canal=/opt/rustwide/target/debug/deps/libcanal-42a5c5254a064cb4.rmeta --extern chan=/opt/rustwide/target/debug/deps/libchan-e1cd795ae85ebd2f.rmeta --extern crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-d177e3708224083a.rmeta --extern crossbeam_channel=/opt/rustwide/target/debug/deps/libcrossbeam_channel-b43b1c7fdb0c8d72.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-56a23125ea7a0df8.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-dcd21aaf0cf646e8.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-e8c0aba92746363a.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-90e5b302e66f0870.rmeta --extern spmc=/opt/rustwide/target/debug/deps/libspmc-a2a2215c29f8b124.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "afa438554054f8b49e0f58af077de29d556c2176988de98ba86d4ec6653180f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afa438554054f8b49e0f58af077de29d556c2176988de98ba86d4ec6653180f1", kill_on_drop: false }`
[INFO] [stdout] afa438554054f8b49e0f58af077de29d556c2176988de98ba86d4ec6653180f1