[INFO] fetching crate sidetree 0.6.1...
[INFO] documenting sidetree-0.6.1 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate sidetree 0.6.1 into /workspace/builds/worker-23/source
[INFO] validating manifest of crates.io crate sidetree 0.6.1 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] removed /workspace/builds/worker-23/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate sidetree 0.6.1
[INFO] finished tweaking crates.io crate sidetree 0.6.1
[INFO] tweaked toml for crates.io crate sidetree 0.6.1 written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] crate crates.io crate sidetree 0.6.1 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] [stderr]     Blocking waiting for file lock on package cache
[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] 43f20b3e1ecbcba9672c40a473fd56cad17a7fcca4a7dc4c04aefee968018593
[INFO] running `Command { std: "docker" "start" "-a" "43f20b3e1ecbcba9672c40a473fd56cad17a7fcca4a7dc4c04aefee968018593", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43f20b3e1ecbcba9672c40a473fd56cad17a7fcca4a7dc4c04aefee968018593", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43f20b3e1ecbcba9672c40a473fd56cad17a7fcca4a7dc4c04aefee968018593", kill_on_drop: false }`
[INFO] [stdout] 43f20b3e1ecbcba9672c40a473fd56cad17a7fcca4a7dc4c04aefee968018593
[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] a6d4e52dbd2bb34b427e0d588bac35d73c03f894155896d2f368c275fa496251
[INFO] running `Command { std: "docker" "start" "-a" "a6d4e52dbd2bb34b427e0d588bac35d73c03f894155896d2f368c275fa496251", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling libc v0.2.124
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]     Checking os_str_bytes v6.0.0
[INFO] [stderr]    Compiling once_cell v1.10.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]     Checking textwrap v0.15.0
[INFO] [stderr]    Compiling cassowary v0.3.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]     Checking path-dedot v3.0.17
[INFO] [stderr]    Compiling clap_lex v0.1.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking path-absolutize v3.0.13
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling combine v4.6.3
[INFO] [stderr]    Compiling dirs-sys v0.3.7
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling termion v1.5.6
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking xdg v2.4.1
[INFO] [stderr]    Compiling tui v0.16.0
[INFO] [stderr]    Compiling clap_derive v3.1.7
[INFO] [stderr]    Compiling clap v3.1.10
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]  Documenting sidetree v0.6.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling sidetree v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generators, generator_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `sidetree`
[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 bin --crate-name sidetree 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=e09c6de3921424a0 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-877bfb9df5ee5f61.rmeta --extern combine=/opt/rustwide/target/debug/deps/libcombine-2fa7967dba5a4649.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-701e134f05ff346a.rmeta --extern path_absolutize=/opt/rustwide/target/debug/deps/libpath_absolutize-9705311d59d6501d.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-d47503f88fb3d493.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-edd25ff2098498e2.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-f960b1577e0425cb.rmeta --extern config_macros=/opt/rustwide/target/debug/deps/libconfig_macros-b1136dc02cae29f3.so --extern syn=/opt/rustwide/target/debug/deps/libsyn-8515bf9c0b8efa63.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-c2d78b84eccfc8a4.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-41c94ef1eb022edb.rmeta --extern tui=/opt/rustwide/target/debug/deps/libtui-bcc14c524a8d0120.rmeta --extern unicode_width=/opt/rustwide/target/debug/deps/libunicode_width-f4a740a6865dcbbd.rmeta --extern xdg=/opt/rustwide/target/debug/deps/libxdg-3aacf6c691b9ccc2.rmeta --cap-lints=warn --crate-version 0.6.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a6d4e52dbd2bb34b427e0d588bac35d73c03f894155896d2f368c275fa496251", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6d4e52dbd2bb34b427e0d588bac35d73c03f894155896d2f368c275fa496251", kill_on_drop: false }`
[INFO] [stdout] a6d4e52dbd2bb34b427e0d588bac35d73c03f894155896d2f368c275fa496251