[INFO] fetching crate unwinding 0.1.4...
[INFO] documenting unwinding-0.1.4 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate unwinding 0.1.4 into /workspace/builds/worker-26/source
[INFO] validating manifest of crates.io crate unwinding 0.1.4 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 unwinding 0.1.4
[INFO] finished tweaking crates.io crate unwinding 0.1.4
[INFO] tweaked toml for crates.io crate unwinding 0.1.4 written to /workspace/builds/worker-26/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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] 4a2e32bcd0ac1accb667fc7072d7306b9eae762a43ec33f1a5e26ec6fa314f67
[INFO] running `Command { std: "docker" "start" "-a" "4a2e32bcd0ac1accb667fc7072d7306b9eae762a43ec33f1a5e26ec6fa314f67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a2e32bcd0ac1accb667fc7072d7306b9eae762a43ec33f1a5e26ec6fa314f67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a2e32bcd0ac1accb667fc7072d7306b9eae762a43ec33f1a5e26ec6fa314f67", kill_on_drop: false }`
[INFO] [stdout] 4a2e32bcd0ac1accb667fc7072d7306b9eae762a43ec33f1a5e26ec6fa314f67
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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] bc04fd98cb80b63889895ae5130cde510c4c5292dfa6dd13070da81000c346e4
[INFO] running `Command { std: "docker" "start" "-a" "bc04fd98cb80b63889895ae5130cde510c4c5292dfa6dd13070da81000c346e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]  Documenting unwinding v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(c_unwind)]
[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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(naked_functions)]
[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:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(asm)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `unwinding`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name unwinding src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="alloc"' --cfg 'feature="default"' --cfg 'feature="dwarf-expr"' --cfg 'feature="fde-phdr"' --cfg 'feature="fde-phdr-dl"' --cfg 'feature="fde-registry"' --cfg 'feature="hide-trace"' --cfg 'feature="libc"' --cfg 'feature="unwinder"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=81b0fad915a9cf7d -L dependency=/opt/rustwide/target/debug/deps --extern gimli=/opt/rustwide/target/debug/deps/libgimli-77dac7e92733ea09.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-73ed28a03122ecc5.rmeta --cap-lints=warn --crate-version 0.1.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bc04fd98cb80b63889895ae5130cde510c4c5292dfa6dd13070da81000c346e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc04fd98cb80b63889895ae5130cde510c4c5292dfa6dd13070da81000c346e4", kill_on_drop: false }`
[INFO] [stdout] bc04fd98cb80b63889895ae5130cde510c4c5292dfa6dd13070da81000c346e4