[INFO] cloning repository https://github.com/googlefan256/limbo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/googlefan256/limbo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgooglefan256%2Flimbo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgooglefan256%2Flimbo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 01faf851f28d590213ddae2a1efc3c9b05fbd1ff
[INFO] documenting googlefan256/limbo against beta-2026-04-21 for beta-1.96-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgooglefan256%2Flimbo" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/googlefan256/limbo
[INFO] finished tweaking git repo https://github.com/googlefan256/limbo
[INFO] tweaked toml for git repo https://github.com/googlefan256/limbo written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/googlefan256/limbo on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/googlefan256/limbo already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5d7901c33f34da85976ab5859b175a98e39f223b151612c644b1bcf4e67842bc
[INFO] running `Command { std: "docker" "start" "-a" "5d7901c33f34da85976ab5859b175a98e39f223b151612c644b1bcf4e67842bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5d7901c33f34da85976ab5859b175a98e39f223b151612c644b1bcf4e67842bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d7901c33f34da85976ab5859b175a98e39f223b151612c644b1bcf4e67842bc", kill_on_drop: false }`
[INFO] [stdout] 5d7901c33f34da85976ab5859b175a98e39f223b151612c644b1bcf4e67842bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 701c1de0e01ad820ecaf2b143bd5c17f5f3ca1b908627044ea2dc6d062ebd090
[INFO] running `Command { std: "docker" "start" "-a" "701c1de0e01ad820ecaf2b143bd5c17f5f3ca1b908627044ea2dc6d062ebd090", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling cfg-if v1.0.1
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling memchr v2.7.5
[INFO] [stderr]    Compiling anyhow v1.0.98
[INFO] [stderr]     Checking getrandom v0.2.16
[INFO] [stderr]     Checking generic-array v0.14.7
[INFO] [stderr]    Compiling hashbrown v0.15.4
[INFO] [stderr]    Compiling gimli v0.31.1
[INFO] [stderr]    Compiling miniz_oxide v0.8.9
[INFO] [stderr]    Compiling rustc-demangle v0.1.25
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling winnow v0.7.11
[INFO] [stderr]     Checking getrandom v0.3.3
[INFO] [stderr]     Checking event-listener v5.4.0
[INFO] [stderr]     Checking futures-lite v2.6.0
[INFO] [stderr]     Checking typeid v1.0.3
[INFO] [stderr]     Checking ahash v0.8.12
[INFO] [stderr]     Checking web-time v1.1.0
[INFO] [stderr]     Checking indexmap v2.10.0
[INFO] [stderr]     Checking bevy_ptr v0.14.2
[INFO] [stderr]     Checking fixedbitset v0.4.2
[INFO] [stderr]     Checking parking_lot_core v0.9.11
[INFO] [stderr]     Checking arrayvec v0.7.6
[INFO] [stderr]     Checking event-listener-strategy v0.5.4
[INFO] [stderr]     Checking nonmax v0.5.5
[INFO] [stderr]     Checking fixedbitset v0.5.7
[INFO] [stderr]     Checking parking_lot v0.12.4
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling object v0.36.7
[INFO] [stderr]     Checking async-channel v2.4.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking glam v0.29.3
[INFO] [stderr]     Checking cesu8 v1.1.0
[INFO] [stderr]     Checking crc32fast v1.4.2
[INFO] [stderr]     Checking async-executor v1.13.2
[INFO] [stderr]    Compiling cc v1.2.27
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking petgraph v0.6.5
[INFO] [stderr]     Checking socket2 v0.5.10
[INFO] [stderr]     Checking flate2 v1.1.2
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking inout v0.1.4
[INFO] [stderr]     Checking bevy_tasks v0.14.2
[INFO] [stderr]     Checking futures-task v0.3.31
[INFO] [stderr]     Checking cipher v0.4.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]    Compiling uuid v1.17.0
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking cfb8 v0.8.1
[INFO] [stderr]     Checking aes v0.8.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking base64ct v1.8.0
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking lazy_static v1.5.0
[INFO] [stderr]    Compiling rustls v0.23.28
[INFO] [stderr]    Compiling thiserror v2.0.12
[INFO] [stderr]    Compiling time-macros v0.2.22
[INFO] [stderr]     Checking regex-syntax v0.8.5
[INFO] [stderr]     Checking pem-rfc7468 v0.7.0
[INFO] [stderr]    Compiling num-bigint-dig v0.8.4
[INFO] [stderr]     Checking num-bigint v0.4.6
[INFO] [stderr]     Checking der v0.7.10
[INFO] [stderr]     Checking num-iter v0.1.45
[INFO] [stderr]     Checking webpki-roots v1.0.1
[INFO] [stderr]     Checking nanorand v0.7.0
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]     Checking flume v0.11.1
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stderr]     Checking signature v2.2.0
[INFO] [stderr]     Checking sharded-slab v0.1.7
[INFO] [stderr]     Checking hmac v0.12.1
[INFO] [stderr] error: could not compile `syn` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/beta-2026-04-21-x86_64-unknown-linux-gnu/bin/rustc --crate-name syn --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.104/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="fold"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="visit"' --cfg 'feature="visit-mut"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "test", "visit", "visit-mut"))' -C metadata=9b6ead467c9f9954 -C extra-filename=-bc99b7eaf0b55120 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-c09048c77d6dd0d8.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-0431a71a56ef9e12.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-6572fa6bb87326c0.rmeta --cap-lints allow --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "701c1de0e01ad820ecaf2b143bd5c17f5f3ca1b908627044ea2dc6d062ebd090", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "701c1de0e01ad820ecaf2b143bd5c17f5f3ca1b908627044ea2dc6d062ebd090", kill_on_drop: false }`
[INFO] [stdout] 701c1de0e01ad820ecaf2b143bd5c17f5f3ca1b908627044ea2dc6d062ebd090