[INFO] fetching crate rustep 0.1.2...
[INFO] documenting rustep-0.1.2 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate rustep 0.1.2 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate rustep 0.1.2 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 rustep 0.1.2
[INFO] finished tweaking crates.io crate rustep 0.1.2
[INFO] tweaked toml for crates.io crate rustep 0.1.2 written to /workspace/builds/worker-12/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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] d7b5be2145754a349ff598f19084a4cdc51f7029962a118357ddddcc18c0fd8a
[INFO] running `Command { std: "docker" "start" "-a" "d7b5be2145754a349ff598f19084a4cdc51f7029962a118357ddddcc18c0fd8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7b5be2145754a349ff598f19084a4cdc51f7029962a118357ddddcc18c0fd8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7b5be2145754a349ff598f19084a4cdc51f7029962a118357ddddcc18c0fd8a", kill_on_drop: false }`
[INFO] [stdout] d7b5be2145754a349ff598f19084a4cdc51f7029962a118357ddddcc18c0fd8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 643226aec665443418a07c6ecdfcc1d87af901a294faeaf361b734895b0d26f6
[INFO] running `Command { std: "docker" "start" "-a" "643226aec665443418a07c6ecdfcc1d87af901a294faeaf361b734895b0d26f6", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[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 proc-macro2 v0.4.30
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking enumflags v0.3.2
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling quote v0.4.2
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]    Compiling enumflags_derive v0.4.1
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]  Documenting rustep v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 | #![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 `rustep`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name rustep src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=970019b01b1bc2d4 -L dependency=/opt/rustwide/target/debug/deps --extern enumflags=/opt/rustwide/target/debug/deps/libenumflags-be033799751e73b5.rmeta --extern enumflags_derive=/opt/rustwide/target/debug/deps/libenumflags_derive-09935258905213f6.so --extern failure=/opt/rustwide/target/debug/deps/libfailure-24e026f609c76d1d.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-507c0f366e71a2dc.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-5220cd8c8f25e148.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-bfd655972382da18.so --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-f68596f2b56d8fce.rmeta --cap-lints=warn --crate-version 0.1.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "643226aec665443418a07c6ecdfcc1d87af901a294faeaf361b734895b0d26f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "643226aec665443418a07c6ecdfcc1d87af901a294faeaf361b734895b0d26f6", kill_on_drop: false }`
[INFO] [stdout] 643226aec665443418a07c6ecdfcc1d87af901a294faeaf361b734895b0d26f6