[INFO] fetching crate rings-snark 0.7.0...
[INFO] checking rings-snark-0.7.0 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate rings-snark 0.7.0 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate rings-snark 0.7.0 on toolchain c387b04bf028733cd561d62128c8a5eee4bc1458
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-2-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate rings-snark 0.7.0
[INFO] finished tweaking crates.io crate rings-snark 0.7.0
[INFO] tweaked toml for crates.io crate rings-snark 0.7.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3031ff58ac170d61bdf1f41ff6ea6bf4922caf0757023717fcdbbca6d601609f
[INFO] running `Command { std: "docker" "start" "-a" "3031ff58ac170d61bdf1f41ff6ea6bf4922caf0757023717fcdbbca6d601609f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3031ff58ac170d61bdf1f41ff6ea6bf4922caf0757023717fcdbbca6d601609f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3031ff58ac170d61bdf1f41ff6ea6bf4922caf0757023717fcdbbca6d601609f", kill_on_drop: false }`
[INFO] [stdout] 3031ff58ac170d61bdf1f41ff6ea6bf4922caf0757023717fcdbbca6d601609f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid -Dtail_expr_drop_order" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 45a640570fab70517418595414399baf89c7d176b5441088d89e271a80c45d83
[INFO] running `Command { std: "docker" "start" "-a" "45a640570fab70517418595414399baf89c7d176b5441088d89e271a80c45d83", kill_on_drop: false }`
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[INFO] [stderr]    Compiling paste v1.0.15
[INFO] [stderr]    Compiling cranelift-codegen v0.91.1
[INFO] [stderr]     Checking bumpalo v3.16.0
[INFO] [stderr]     Checking try-lock v0.2.5
[INFO] [stderr]     Checking addr2line v0.24.1
[INFO] [stderr]     Checking percent-encoding v2.3.1
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking want v0.3.1
[INFO] [stderr]     Checking wasmparser v0.121.2
[INFO] [stderr]     Checking form_urlencoded v1.2.1
[INFO] [stderr]    Compiling darling_core v0.20.10
[INFO] [stderr]     Checking unicode-normalization v0.1.24
[INFO] [stderr]     Checking shared-buffer v0.1.4
[INFO] [stderr]     Checking dirs-next v2.0.0
[INFO] [stderr]    Compiling pasta-msm v0.1.4
[INFO] [stderr]     Checking http-body v0.4.6
[INFO] [stderr]     Checking sct v0.7.1
[INFO] [stderr]     Checking rustls-webpki v0.101.7
[INFO] [stderr]     Checking wasm-encoder v0.32.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking memmap2 v0.5.10
[INFO] [stderr]    Compiling wasmer-compiler-cranelift v4.3.7
[INFO] [stderr]    Compiling halo2curves v0.6.1
[INFO] [stderr]     Checking siphasher v0.3.11
[INFO] [stderr]     Checking unicode-bidi v0.3.15
[INFO] [stderr]     Checking ryu v1.0.18
[INFO] [stderr]    Compiling serde_json v1.0.128
[INFO] [stderr]     Checking self_cell v1.0.4
[INFO] [stderr]     Checking tower-service v0.3.3
[INFO] [stderr]     Checking unicode-width v0.1.14
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]     Checking httpdate v1.0.3
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking idna v0.5.0
[INFO] [stderr]     Checking phf_shared v0.10.0
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking crossbeam-deque v0.7.4
[INFO] [stderr]     Checking term v0.7.0
[INFO] [stderr]     Checking wast v64.0.0
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking fixedbitset v0.4.2
[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/c387b04bf028733cd561d62128c8a5eee4bc1458/bin/rustc --crate-name syn --edition=2018 /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/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="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' --check-cfg 'cfg(docsrs)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "quote", "test", "visit", "visit-mut"))' -C metadata=e45fbff90ef51052 -C extra-filename=-e45fbff90ef51052 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-0bdc4b6937d713e3.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-a9c7eb8606adb9d2.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-c1d05c67d34096ea.rmeta --cap-lints allow --cap-lints=forbid -Dtail_expr_drop_order` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "45a640570fab70517418595414399baf89c7d176b5441088d89e271a80c45d83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45a640570fab70517418595414399baf89c7d176b5441088d89e271a80c45d83", kill_on_drop: false }`
[INFO] [stdout] 45a640570fab70517418595414399baf89c7d176b5441088d89e271a80c45d83