[INFO] fetching crate sidetree 0.6.1...
[INFO] documenting sidetree-0.6.1 against 1.61.0 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 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded path-absolutize v3.0.13
[INFO] [stderr]   Downloaded path-dedot v3.0.17
[INFO] [stderr]   Downloaded combine v4.6.3
[INFO] [stderr]   Downloaded clap v3.1.10
[INFO] [stderr]   Downloaded tui v0.16.0
[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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86afd3604562408f547a525a09a21f564ddb425ae3cc0602750bf305e83787e5
[INFO] running `Command { std: "docker" "start" "-a" "86afd3604562408f547a525a09a21f564ddb425ae3cc0602750bf305e83787e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86afd3604562408f547a525a09a21f564ddb425ae3cc0602750bf305e83787e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86afd3604562408f547a525a09a21f564ddb425ae3cc0602750bf305e83787e5", kill_on_drop: false }`
[INFO] [stdout] 86afd3604562408f547a525a09a21f564ddb425ae3cc0602750bf305e83787e5
[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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46f3f79aa152e09e84a0a9adb0e5850e15c619a7c5029a31bc5a24ce9827df61
[INFO] running `Command { std: "docker" "start" "-a" "46f3f79aa152e09e84a0a9adb0e5850e15c619a7c5029a31bc5a24ce9827df61", 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 serde v1.0.136
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking os_str_bytes v6.0.0
[INFO] [stderr]    Compiling cassowary v0.3.0
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]    Compiling textwrap v0.15.0
[INFO] [stderr]     Checking unicode-segmentation v1.9.0
[INFO] [stderr]     Checking strsim v0.10.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]    Compiling path-dedot v3.0.17
[INFO] [stderr]     Checking clap_lex v0.1.1
[INFO] [stderr]    Compiling path-absolutize v3.0.13
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]     Checking combine v4.6.3
[INFO] [stderr]     Checking quote v1.0.18
[INFO] [stderr]     Checking dirs-sys v0.3.7
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking xdg v2.4.1
[INFO] [stderr]     Checking 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 stable 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] [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 `sidetree`
[INFO] [stderr] 
[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 -C metadata=3ea3e4feef28b391 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-e23cc302293e5a8a.rmeta --extern combine=/opt/rustwide/target/debug/deps/libcombine-58f0ff7cf96ee76c.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern path_absolutize=/opt/rustwide/target/debug/deps/libpath_absolutize-27466dc3b979c63e.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-4e533d373e7b1d20.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-fe011bdc19747dc1.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-2d510514497e24a7.rmeta --extern config_macros=/opt/rustwide/target/debug/deps/libconfig_macros-7d31bca61441686d.so --extern syn=/opt/rustwide/target/debug/deps/libsyn-aaa666dc37c39da7.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-038568f0c5e8422a.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-fcc27c7d6dbe32ed.rmeta --extern tui=/opt/rustwide/target/debug/deps/libtui-5117450d75ebbf55.rmeta --extern unicode_width=/opt/rustwide/target/debug/deps/libunicode_width-6b6dfc73d9148d18.rmeta --extern xdg=/opt/rustwide/target/debug/deps/libxdg-accdf5eb70bc48e1.rmeta --cap-lints=warn --crate-version 0.6.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "46f3f79aa152e09e84a0a9adb0e5850e15c619a7c5029a31bc5a24ce9827df61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46f3f79aa152e09e84a0a9adb0e5850e15c619a7c5029a31bc5a24ce9827df61", kill_on_drop: false }`
[INFO] [stdout] 46f3f79aa152e09e84a0a9adb0e5850e15c619a7c5029a31bc5a24ce9827df61