[INFO] fetching crate skar-client 0.18.2...
[INFO] testing skar-client-0.18.2 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate skar-client 0.18.2 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate skar-client 0.18.2
[INFO] finished tweaking crates.io crate skar-client 0.18.2
[INFO] tweaked toml for crates.io crate skar-client 0.18.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate skar-client 0.18.2 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 402 packages to latest compatible versions
[INFO] [stderr]       Adding alloy-dyn-abi v0.7.7 (available: v1.5.7)
[INFO] [stderr]       Adding alloy-json-abi v0.7.7 (available: v1.5.7)
[INFO] [stderr]       Adding capnp v0.19.8 (available: v0.25.4)
[INFO] [stderr]       Adding crypto-common v0.1.6 (available: v0.1.7)
[INFO] [stderr]       Adding faster-hex v0.9.0 (available: v0.10.0)
[INFO] [stderr]       Adding hex-literal v0.4.1 (available: v1.1.0)
[INFO] [stderr]       Adding polars-arrow v0.39.2 (available: v0.53.0)
[INFO] [stderr]       Adding polars-parquet v0.39.2 (available: v0.53.0)
[INFO] [stderr]       Adding rand v0.8.6 (available: v0.10.1)
[INFO] [stderr]       Adding reqwest v0.12.28 (available: v0.13.2)
[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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 1f503a5d4a4817f247048b43cd2b0973fc445d1fa954408eafcedc782566d5d0
[INFO] running `Command { std: "docker" "start" "-a" "1f503a5d4a4817f247048b43cd2b0973fc445d1fa954408eafcedc782566d5d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f503a5d4a4817f247048b43cd2b0973fc445d1fa954408eafcedc782566d5d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f503a5d4a4817f247048b43cd2b0973fc445d1fa954408eafcedc782566d5d0", kill_on_drop: false }`
[INFO] [stdout] 1f503a5d4a4817f247048b43cd2b0973fc445d1fa954408eafcedc782566d5d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aac1999e32b0b113b1678d0ba848c9815490c3ad9154b71de2d504abf1caef1e
[INFO] running `Command { std: "docker" "start" "-a" "aac1999e32b0b113b1678d0ba848c9815490c3ad9154b71de2d504abf1caef1e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling libc v0.2.186
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling find-msvc-tools v0.1.9
[INFO] [stderr]    Compiling version_check v0.9.5
[INFO] [stderr]    Compiling itoa v1.0.18
[INFO] [stderr]    Compiling futures-core v0.3.32
[INFO] [stderr]    Compiling stable_deref_trait v1.2.1
[INFO] [stderr]    Compiling futures-sink v0.3.32
[INFO] [stderr]    Compiling once_cell v1.21.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling zerocopy v0.8.48
[INFO] [stderr]    Compiling futures-io v0.3.32
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]    Compiling memchr v2.8.0
[INFO] [stderr]    Compiling pkg-config v0.3.33
[INFO] [stderr]    Compiling equivalent v1.0.2
[INFO] [stderr]    Compiling hashbrown v0.17.0
[INFO] [stderr]    Compiling futures-channel v0.3.32
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling cpufeatures v0.2.17
[INFO] [stderr]    Compiling crunchy v0.2.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling litemap v0.8.2
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling paste v1.0.15
[INFO] [stderr]    Compiling rayon-core v1.13.0
[INFO] [stderr]    Compiling writeable v0.6.3
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling ahash v0.8.12
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling icu_normalizer_data v2.2.0
[INFO] [stderr]    Compiling bitflags v2.11.1
[INFO] [stderr]    Compiling icu_properties_data v2.2.0
[INFO] [stderr]    Compiling array-init-cursor v0.2.1
[INFO] [stderr]    Compiling zeroize v1.8.2
[INFO] [stderr]    Compiling target-features v0.1.6
[INFO] [stderr]    Compiling indexmap v2.14.0
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling rustls-pki-types v1.14.1
[INFO] [stderr]    Compiling planus v0.3.1
[INFO] [stderr]    Compiling crossbeam-deque v0.8.6
[INFO] [stderr]    Compiling smartstring v1.0.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling zstd-safe v7.2.4
[INFO] [stderr]    Compiling either v1.15.0
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling untrusted v0.9.0
[INFO] [stderr]    Compiling polars-utils v0.39.2
[INFO] [stderr]    Compiling const-hex v1.18.1
[INFO] [stderr]    Compiling heck v0.5.0
[INFO] [stderr]    Compiling simdutf8 v0.1.5
[INFO] [stderr]    Compiling ryu v1.0.23
[INFO] [stderr]    Compiling dunce v1.0.5
[INFO] [stderr]    Compiling ruint-macro v1.2.1
[INFO] [stderr]    Compiling rustls v0.23.39
[INFO] [stderr]    Compiling allocator-api2 v0.2.21
[INFO] [stderr]    Compiling raw-cpuid v11.6.0
[INFO] [stderr]    Compiling polars-arrow v0.39.2
[INFO] [stderr]    Compiling tracing-core v0.1.36
[INFO] [stderr]    Compiling alloc-no-stdlib v2.0.4
[INFO] [stderr]    Compiling capnp v0.19.8
[INFO] [stderr]    Compiling hex-literal v0.4.1
[INFO] [stderr]    Compiling subtle v2.6.1
[INFO] [stderr]    Compiling crc32fast v1.5.0
[INFO] [stderr]    Compiling ruint v1.18.0
[INFO] [stderr]    Compiling chrono v0.4.44
[INFO] [stderr]    Compiling rayon v1.12.0
[INFO] [stderr]    Compiling alloc-stdlib v0.2.2
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling sync_wrapper v1.0.2
[INFO] [stderr]    Compiling atoi_simd v0.15.6
[INFO] [stderr]    Compiling winnow v0.6.26
[INFO] [stderr]    Compiling simd-adler32 v0.3.9
[INFO] [stderr]    Compiling foreign_vec v0.1.0
[INFO] [stderr]    Compiling dyn-clone v1.0.20
[INFO] [stderr]    Compiling snap v1.1.1
[INFO] [stderr]    Compiling jobserver v0.1.34
[INFO] [stderr]    Compiling socket2 v0.6.3
[INFO] [stderr]    Compiling mio v1.2.0
[INFO] [stderr]    Compiling getrandom v0.2.17
[INFO] [stderr]    Compiling cc v1.2.61
[INFO] [stderr]    Compiling tracing v0.1.44
[INFO] [stderr]    Compiling fast-float v0.2.0
[INFO] [stderr]    Compiling streaming-iterator v0.1.9
[INFO] [stderr]    Compiling ipnet v2.12.0
[INFO] [stderr]    Compiling ethnum v1.5.3
[INFO] [stderr]    Compiling strength_reduce v0.2.4
[INFO] [stderr]    Compiling adler2 v2.0.1
[INFO] [stderr]    Compiling miniz_oxide v0.8.9
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling brotli-decompressor v2.5.1
[INFO] [stderr]    Compiling webpki-roots v1.0.7
[INFO] [stderr]    Compiling fallible-streaming-iterator v0.1.9
[INFO] [stderr]    Compiling iri-string v0.7.12
[INFO] [stderr]    Compiling serde_json v1.0.149
[INFO] [stderr]    Compiling streaming-decompression v0.1.2
[INFO] [stderr]    Compiling log v0.4.29
[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-2.0.117/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=f50fd23ee619c33a -C extra-filename=-db35dfc171bce774 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-0fa97b1aa44f5fda.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-544fd508281ca8af.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-423507c85e36a25a.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" "aac1999e32b0b113b1678d0ba848c9815490c3ad9154b71de2d504abf1caef1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aac1999e32b0b113b1678d0ba848c9815490c3ad9154b71de2d504abf1caef1e", kill_on_drop: false }`
[INFO] [stdout] aac1999e32b0b113b1678d0ba848c9815490c3ad9154b71de2d504abf1caef1e
