[INFO] fetching crate cargo-minicov 0.1.2...
[INFO] documenting cargo-minicov-0.1.2 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate cargo-minicov 0.1.2 into /workspace/builds/worker-57/source
[INFO] validating manifest of crates.io crate cargo-minicov 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 cargo-minicov 0.1.2
[INFO] finished tweaking crates.io crate cargo-minicov 0.1.2
[INFO] tweaked toml for crates.io crate cargo-minicov 0.1.2 written to /workspace/builds/worker-57/source/Cargo.toml
[INFO] crate crates.io crate cargo-minicov 0.1.2 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-57/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/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] 6c0137cd89f457585ceb30b6906ca9a181d95d9da666160bb5ec3788296a80a6
[INFO] running `Command { std: "docker" "start" "-a" "6c0137cd89f457585ceb30b6906ca9a181d95d9da666160bb5ec3788296a80a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6c0137cd89f457585ceb30b6906ca9a181d95d9da666160bb5ec3788296a80a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c0137cd89f457585ceb30b6906ca9a181d95d9da666160bb5ec3788296a80a6", kill_on_drop: false }`
[INFO] [stdout] 6c0137cd89f457585ceb30b6906ca9a181d95d9da666160bb5ec3788296a80a6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-57/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] 623514ebad299342bc7acc5e365c48400caf26df41b87949f8a50a2c329e6c8e
[INFO] running `Command { std: "docker" "start" "-a" "623514ebad299342bc7acc5e365c48400caf26df41b87949f8a50a2c329e6c8e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling unicode-segmentation v1.7.0
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking postcard-cobs v0.1.5-pre
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling structopt-derive v0.4.13
[INFO] [stderr]     Checking structopt v0.3.20
[INFO] [stderr]     Checking postcard v0.5.1
[INFO] [stderr]  Documenting cargo-minicov v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(profiler_runtime_lib)]
[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 `cargo-minicov`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name cargo_minicov 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=c29ea462509c5120 -L dependency=/opt/rustwide/target/debug/deps --extern postcard=/opt/rustwide/target/debug/deps/libpostcard-ff33c8dd0d9ed366.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-03960c2159a676a3.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-bc3f7ffe8f7a36d3.rmeta --cap-lints=warn --crate-version 0.1.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "623514ebad299342bc7acc5e365c48400caf26df41b87949f8a50a2c329e6c8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "623514ebad299342bc7acc5e365c48400caf26df41b87949f8a50a2c329e6c8e", kill_on_drop: false }`
[INFO] [stdout] 623514ebad299342bc7acc5e365c48400caf26df41b87949f8a50a2c329e6c8e