[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-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwoodgear%2Fword-forms-rust" "/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/woodgear/word-forms-rust on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", 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-7/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-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded Inflector v0.11.3
[INFO] [stderr]   Downloaded strum v0.10.0
[INFO] [stderr]   Downloaded regex v1.0.2
[INFO] [stderr]   Downloaded difflib v0.4.0
[INFO] [stderr]   Downloaded cute v0.3.0
[INFO] [stderr]   Downloaded rayon v1.0.2
[INFO] [stderr]   Downloaded strum_macros v0.10.0
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 53edb4f85e07d6477f17ef45b995fe3f9a9c4e8060002374ab0f7e96556c55ef
[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" "53edb4f85e07d6477f17ef45b995fe3f9a9c4e8060002374ab0f7e96556c55ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "53edb4f85e07d6477f17ef45b995fe3f9a9c4e8060002374ab0f7e96556c55ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53edb4f85e07d6477f17ef45b995fe3f9a9c4e8060002374ab0f7e96556c55ef", kill_on_drop: false }`
[INFO] [stdout] 53edb4f85e07d6477f17ef45b995fe3f9a9c4e8060002374ab0f7e96556c55ef
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] addc78699c7fd51fee7b886ba8075aff2323bcbda10b4eec28baf9769d0fed75
[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" "addc78699c7fd51fee7b886ba8075aff2323bcbda10b4eec28baf9769d0fed75", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking cfg-if v0.1.4
[INFO] [stderr]     Checking lazy_static v1.0.2
[INFO] [stderr]    Compiling cc v1.0.18
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling regex v1.0.2
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]     Checking rustc-demangle v0.1.9
[INFO] [stderr]     Checking cute v0.3.0
[INFO] [stderr]     Checking strum v0.10.0
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.9
[INFO] [stderr]     Checking regex-syntax v0.6.2
[INFO] [stderr]     Checking itertools v0.7.8
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking log v0.4.3
[INFO] [stderr]     Checking thread_local v0.3.5
[INFO] [stderr]     Checking aho-corasick v0.6.6
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling quote v0.6.4
[INFO] [stderr]    Compiling syn v0.14.5
[INFO] [stderr]    Compiling backtrace-sys v0.1.23
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]     Checking backtrace v0.3.9
[INFO] [stderr]     Checking failure v0.1.1
[INFO] [stderr]    Compiling strum_macros v0.10.0
[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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_from)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[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 `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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern inflector=/opt/rustwide/target/debug/deps/libinflector-b2c861f45ddf643f.rmeta --extern cute=/opt/rustwide/target/debug/deps/libcute-c6b5448bf79597e6.rmeta --extern difflib=/opt/rustwide/target/debug/deps/libdifflib-b4dc68034cc6de13.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-c24aa40a30cc2666.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-135b2d422b67c4bb.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-031c9ff78e10d4ff.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-abdfb3fb6a4793bd.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-fd20bbec81dce875.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-5a8c495a8f4e6ff9.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-ee35998c0ebcbd0b.so --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "addc78699c7fd51fee7b886ba8075aff2323bcbda10b4eec28baf9769d0fed75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "addc78699c7fd51fee7b886ba8075aff2323bcbda10b4eec28baf9769d0fed75", kill_on_drop: false }`
[INFO] [stdout] addc78699c7fd51fee7b886ba8075aff2323bcbda10b4eec28baf9769d0fed75