[INFO] cloning repository https://github.com/woodgear/word-forms-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/woodgear/word-forms-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwoodgear%2Fword-forms-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwoodgear%2Fword-forms-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e9962413f124091519fc2c1889b584ce2510fc60
[INFO] documenting woodgear/word-forms-rust 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%2Fwoodgear%2Fword-forms-rust" "/workspace/builds/worker-23/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-23/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/woodgear/word-forms-rust 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/woodgear/word-forms-rust
[INFO] finished tweaking git repo https://github.com/woodgear/word-forms-rust
[INFO] tweaked toml for git repo https://github.com/woodgear/word-forms-rust written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] crate git repo https://github.com/woodgear/word-forms-rust 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-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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] 464b9e1c539b54239992042029470c5cac16b33785fe7db5fb693a5811bd8eac
[INFO] running `Command { std: "docker" "start" "-a" "464b9e1c539b54239992042029470c5cac16b33785fe7db5fb693a5811bd8eac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "464b9e1c539b54239992042029470c5cac16b33785fe7db5fb693a5811bd8eac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "464b9e1c539b54239992042029470c5cac16b33785fe7db5fb693a5811bd8eac", kill_on_drop: false }`
[INFO] [stdout] 464b9e1c539b54239992042029470c5cac16b33785fe7db5fb693a5811bd8eac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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] fe3176255b83ee542975be375a98517a53f7cd51706e5c365668e7afa2b7795d
[INFO] running `Command { std: "docker" "start" "-a" "fe3176255b83ee542975be375a98517a53f7cd51706e5c365668e7afa2b7795d", kill_on_drop: false }`
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]    Compiling cc v1.0.18
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling regex v1.0.2
[INFO] [stderr]     Checking ucd-util v0.1.1
[INFO] [stderr]     Checking utf8-ranges v1.0.0
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]     Checking rustc-demangle v0.1.9
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking cute v0.3.0
[INFO] [stderr]     Checking strum v0.10.0
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking log v0.4.3
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]    Compiling proc-macro2 v0.4.9
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking regex-syntax v0.6.2
[INFO] [stderr]     Checking itertools v0.7.8
[INFO] [stderr]     Checking aho-corasick v0.6.6
[INFO] [stderr]     Checking thread_local v0.3.5
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling quote v0.6.4
[INFO] [stderr]    Compiling syn v0.14.5
[INFO] [stderr]    Compiling backtrace-sys v0.1.23
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]     Checking backtrace v0.3.9
[INFO] [stderr]    Compiling strum_macros v0.10.0
[INFO] [stderr]     Checking failure v0.1.1
[INFO] [stderr]     Checking Inflector v0.11.3
[INFO] [stderr]  Documenting word-forms-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_from)]
[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 `word-forms-rust`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name word_forms_rust src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=1b0837e46c1eaa56 -L dependency=/opt/rustwide/target/debug/deps --extern inflector=/opt/rustwide/target/debug/deps/libinflector-50ef99b58eeb039f.rmeta --extern cute=/opt/rustwide/target/debug/deps/libcute-fc02a077b6f5ef28.rmeta --extern difflib=/opt/rustwide/target/debug/deps/libdifflib-0ec1e07cd0a29ae2.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-e2605574cbff2510.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-3451aa428ed29eef.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-2b064f0185e01046.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-2135d629fddb19ce.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-d92b3b5218641512.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-21820ce0d3f176d4.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-91923190b7309227.so --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "fe3176255b83ee542975be375a98517a53f7cd51706e5c365668e7afa2b7795d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe3176255b83ee542975be375a98517a53f7cd51706e5c365668e7afa2b7795d", kill_on_drop: false }`
[INFO] [stdout] fe3176255b83ee542975be375a98517a53f7cd51706e5c365668e7afa2b7795d