[INFO] cloning repository https://github.com/meganomic/megamonic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/meganomic/megamonic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganomic%2Fmegamonic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganomic%2Fmegamonic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c4513af7ea2d078c1dc619cadefde7d4f0bb2180
[INFO] documenting meganomic/megamonic against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeganomic%2Fmegamonic" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/meganomic/megamonic 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 git repo https://github.com/meganomic/megamonic
[INFO] finished tweaking git repo https://github.com/meganomic/megamonic
[INFO] tweaked toml for git repo https://github.com/meganomic/megamonic written to /workspace/builds/worker-6/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]  Downloading crates ...
[INFO] [stderr]   Downloaded nvml-wrapper v0.7.0
[INFO] [stderr]   Downloaded btoi v0.4.2
[INFO] [stderr]   Downloaded wrapcenum-derive v0.4.0
[INFO] [stderr]   Downloaded libc-strftime v0.2.0
[INFO] [stderr]   Downloaded libsensors-sys v0.2.0
[INFO] [stderr]   Downloaded sensors v0.2.2
[INFO] [stderr]   Downloaded nvml-wrapper-sys v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] a04be1cc49d13c2501001f8f16f99901beeae6ea070014964c0b45fd5bfc3ac4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a04be1cc49d13c2501001f8f16f99901beeae6ea070014964c0b45fd5bfc3ac4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a04be1cc49d13c2501001f8f16f99901beeae6ea070014964c0b45fd5bfc3ac4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a04be1cc49d13c2501001f8f16f99901beeae6ea070014964c0b45fd5bfc3ac4", kill_on_drop: false }`
[INFO] [stdout] a04be1cc49d13c2501001f8f16f99901beeae6ea070014964c0b45fd5bfc3ac4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ec084aba4ba75c152c38715b574c2af390503cd203aac103f3df6b2137f8cf2e
[INFO] running `Command { std: "docker" "start" "-a" "ec084aba4ba75c152c38715b574c2af390503cd203aac103f3df6b2137f8cf2e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libsensors-sys v0.2.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]    Compiling megamonic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling anyhow v1.0.57
[INFO] [stderr]     Checking libloading v0.6.7
[INFO] [stderr]     Checking nvml-wrapper-sys v0.5.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking sensors v0.2.2
[INFO] [stderr]     Checking libc-strftime v0.2.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking btoi v0.4.2
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling wrapcenum-derive v0.4.0
[INFO] [stderr]     Checking thiserror v1.0.31
[INFO] [stderr]     Checking nvml-wrapper v0.7.0
[INFO] [stderr]  Documenting megamonic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(backtrace)]
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(iter_intersperse)]
[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 `megamonic`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name megamonic src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b2dd0303c37369d3 -L dependency=/opt/rustwide/target/debug/deps --extern ahash=/opt/rustwide/target/debug/deps/libahash-f88aed6a2fc2cec5.rmeta --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-43b6d63dd0488739.rmeta --extern btoi=/opt/rustwide/target/debug/deps/libbtoi-515a4484dce682e8.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-cc333e267bc0257a.rmeta --extern libc_strftime=/opt/rustwide/target/debug/deps/liblibc_strftime-991b16868cb1ea99.rmeta --extern nvml_wrapper=/opt/rustwide/target/debug/deps/libnvml_wrapper-b76b956aaa7a79ee.rmeta --extern sensors=/opt/rustwide/target/debug/deps/libsensors-6c59c53695715e0a.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-8ad0e43b38462c16.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ec084aba4ba75c152c38715b574c2af390503cd203aac103f3df6b2137f8cf2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec084aba4ba75c152c38715b574c2af390503cd203aac103f3df6b2137f8cf2e", kill_on_drop: false }`
[INFO] [stdout] ec084aba4ba75c152c38715b574c2af390503cd203aac103f3df6b2137f8cf2e