[INFO] fetching crate postform_rtt 0.3.0...
[INFO] testing postform_rtt-0.3.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate postform_rtt 0.3.0 into /workspace/builds/worker-23/source
[INFO] validating manifest of crates.io crate postform_rtt 0.3.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate postform_rtt 0.3.0
[INFO] finished tweaking crates.io crate postform_rtt 0.3.0
[INFO] tweaked toml for crates.io crate postform_rtt 0.3.0 written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] crate crates.io crate postform_rtt 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8bb60537a956e5780ddde92153b4b62d71ecd5ebbbe4d1e13ec94538c43c1d82
[INFO] running `Command { std: "docker" "start" "-a" "8bb60537a956e5780ddde92153b4b62d71ecd5ebbbe4d1e13ec94538c43c1d82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8bb60537a956e5780ddde92153b4b62d71ecd5ebbbe4d1e13ec94538c43c1d82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bb60537a956e5780ddde92153b4b62d71ecd5ebbbe4d1e13ec94538c43c1d82", kill_on_drop: false }`
[INFO] [stdout] 8bb60537a956e5780ddde92153b4b62d71ecd5ebbbe4d1e13ec94538c43c1d82
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ce57be5ce5f0492675395e59dcd24ebca775977c49c11a794be7ec1c43d5ba5
[INFO] running `Command { std: "docker" "start" "-a" "1ce57be5ce5f0492675395e59dcd24ebca775977c49c11a794be7ec1c43d5ba5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling syn v1.0.62
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling cc v1.0.67
[INFO] [stderr]    Compiling serde_derive v1.0.124
[INFO] [stderr]    Compiling serde v1.0.124
[INFO] [stderr]    Compiling libflate_lz77 v1.0.0
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
[INFO] [stderr]    Compiling dtoa v0.4.7
[INFO] [stderr]    Compiling regex-syntax v0.6.22
[INFO] [stderr]    Compiling wasmparser v0.57.0
[INFO] [stderr]    Compiling bindgen v0.57.0
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling anyhow v1.0.38
[INFO] [stderr]    Compiling byteorder v1.4.2
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling pin-project-lite v0.2.6
[INFO] [stderr]    Compiling plain v0.2.3
[INFO] [stderr]    Compiling fallible-iterator v0.2.0
[INFO] [stderr]    Compiling radium v0.3.0
[INFO] [stderr]    Compiling gimli v0.23.0
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling ihex v3.0.0
[INFO] [stderr]    Compiling svg v0.8.2
[INFO] [stderr]    Compiling owo-colors v1.3.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.18
[INFO] [stderr]    Compiling object v0.23.0
[INFO] [stderr]    Compiling leb128 v0.2.4
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling cobs v0.1.4
[INFO] [stderr]    Compiling clang-sys v1.1.1
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling libftdi1-sys v1.0.0
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling sharded-slab v0.1.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling libflate v1.0.3
[INFO] [stderr]    Compiling bitvec v0.17.4
[INFO] [stderr]    Compiling thread_local v1.1.3
[INFO] [stderr]    Compiling eyre v0.6.5
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling tracing-subscriber v0.2.16
[INFO] [stderr]    Compiling gimli v0.22.0
[INFO] [stderr]    Compiling hidapi v1.2.5
[INFO] [stderr]    Compiling filetime v0.2.14
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling flate2 v1.0.20
[INFO] [stderr]    Compiling which v3.1.1
[INFO] [stderr]    Compiling nix v0.20.0
[INFO] [stderr]    Compiling termion v1.5.6
[INFO] [stderr]    Compiling regex v1.4.3
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling tar v0.4.33
[INFO] [stderr]    Compiling addr2line v0.14.1
[INFO] [stderr]    Compiling object v0.21.1
[INFO] [stderr]    Compiling object v0.22.0
[INFO] [stderr]    Compiling cexpr v0.4.0
[INFO] [stderr]    Compiling backtrace v0.3.56
[INFO] [stderr]    Compiling libusb1-sys v0.4.4
[INFO] [stderr]    Compiling env_logger v0.8.3
[INFO] [stderr]    Compiling rusb v0.6.5
[INFO] [stderr]    Compiling jaylink v0.1.5
[INFO] [stderr] error: could not compile `syn`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name syn --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-1.0.62/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --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-mut"' -C metadata=c39b2990cb8f685c -C extra-filename=-c39b2990cb8f685c --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-4d038e1ab37629ce.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-b5f902cc5fd286ca.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-a00294059a9d31c4.rmeta --cap-lints allow --cap-lints=warn --cfg syn_disable_nightly_tests` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "1ce57be5ce5f0492675395e59dcd24ebca775977c49c11a794be7ec1c43d5ba5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ce57be5ce5f0492675395e59dcd24ebca775977c49c11a794be7ec1c43d5ba5", kill_on_drop: false }`
[INFO] [stdout] 1ce57be5ce5f0492675395e59dcd24ebca775977c49c11a794be7ec1c43d5ba5