[INFO] fetching crate coppers 0.1.1...
[INFO] documenting coppers-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate coppers 0.1.1 into /workspace/builds/worker-84/source
[INFO] validating manifest of crates.io crate coppers 0.1.1 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] started tweaking crates.io crate coppers 0.1.1
[INFO] finished tweaking crates.io crate coppers 0.1.1
[INFO] tweaked toml for crates.io crate coppers 0.1.1 written to /workspace/builds/worker-84/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pyo3-macros v0.16.5
[INFO] [stderr]   Downloaded pyo3-ffi v0.16.5
[INFO] [stderr]   Downloaded target-lexicon v0.12.4
[INFO] [stderr]   Downloaded pyo3-build-config v0.16.5
[INFO] [stderr]   Downloaded pyo3-macros-backend v0.16.5
[INFO] [stderr]   Downloaded indoc v1.0.6
[INFO] [stderr]   Downloaded git2 v0.14.4
[INFO] [stderr]   Downloaded libssh2-sys v0.2.23
[INFO] [stderr]   Downloaded pyo3 v0.16.5
[INFO] [stderr]   Downloaded libgit2-sys v0.13.4+1.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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] 45cb14e4159c40c6733638f058012a95efa968d386ccc9ec02f18718cab1ef49
[INFO] running `Command { std: "docker" "start" "-a" "45cb14e4159c40c6733638f058012a95efa968d386ccc9ec02f18718cab1ef49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45cb14e4159c40c6733638f058012a95efa968d386ccc9ec02f18718cab1ef49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45cb14e4159c40c6733638f058012a95efa968d386ccc9ec02f18718cab1ef49", kill_on_drop: false }`
[INFO] [stdout] 45cb14e4159c40c6733638f058012a95efa968d386ccc9ec02f18718cab1ef49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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] dd6fb7b5f1a7c51f567d6b738d2587c1ce85941b0a0f2629843ddd88222bb03f
[INFO] running `Command { std: "docker" "start" "-a" "dd6fb7b5f1a7c51f567d6b738d2587c1ce85941b0a0f2629843ddd88222bb03f", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.25
[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 serde_derive v1.0.137
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking unicode-bidi v0.3.8
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling serde_json v1.0.81
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking ryu v1.0.10
[INFO] [stderr]     Checking openssl-probe v0.1.5
[INFO] [stderr]     Checking itoa v1.0.2
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]    Compiling jobserver v0.1.24
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]    Compiling openssl-sys v0.9.73
[INFO] [stderr]    Compiling libz-sys v1.1.8
[INFO] [stderr]    Compiling libssh2-sys v0.2.23
[INFO] [stderr]    Compiling libgit2-sys v0.13.4+1.4.2
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking git2 v0.14.4
[INFO] [stderr]  Documenting coppers v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(test)]
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(internal_output_capture)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^
[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 `coppers`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name coppers src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=2e891edd4540fe69 -L dependency=/opt/rustwide/target/debug/deps --extern git2=/opt/rustwide/target/debug/deps/libgit2-b257c601b2830199.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-e6e12260d7fb4e79.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-1c5e9376ee8338dc.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-69a2bcf8b67d1cdf.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-c02271e501f03aef.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "dd6fb7b5f1a7c51f567d6b738d2587c1ce85941b0a0f2629843ddd88222bb03f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd6fb7b5f1a7c51f567d6b738d2587c1ce85941b0a0f2629843ddd88222bb03f", kill_on_drop: false }`
[INFO] [stdout] dd6fb7b5f1a7c51f567d6b738d2587c1ce85941b0a0f2629843ddd88222bb03f