[INFO] cloning repository https://github.com/RustPython/RustPython
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RustPython/RustPython" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRustPython%2FRustPython", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRustPython%2FRustPython'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dcc8043edddea5d85e3cc96a7646c043060295ba
[INFO] testing RustPython/RustPython against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRustPython%2FRustPython" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RustPython/RustPython on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-7/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/RustPython/RustPython
[INFO] finished tweaking git repo https://github.com/RustPython/RustPython
[INFO] tweaked toml for git repo https://github.com/RustPython/RustPython written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/RustPython/RustPython already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 64bc19a7dbdba0d3f5bb4de9fa695e361eead8628d5b2dc28c7a04f239553f5f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "64bc19a7dbdba0d3f5bb4de9fa695e361eead8628d5b2dc28c7a04f239553f5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "64bc19a7dbdba0d3f5bb4de9fa695e361eead8628d5b2dc28c7a04f239553f5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64bc19a7dbdba0d3f5bb4de9fa695e361eead8628d5b2dc28c7a04f239553f5f", kill_on_drop: false }`
[INFO] [stdout] 64bc19a7dbdba0d3f5bb4de9fa695e361eead8628d5b2dc28c7a04f239553f5f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1c6126975c75b2ca5504562378e129035ccc0c4adc3613bf8c28d9194551ea9e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1c6126975c75b2ca5504562378e129035ccc0c4adc3613bf8c28d9194551ea9e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling siphasher v0.3.6
[INFO] [stderr]    Compiling unic-common v0.9.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling unic-char-range v0.9.0
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling diff v0.1.12
[INFO] [stderr]    Compiling pico-args v0.4.2
[INFO] [stderr]    Compiling lz4_flex v0.7.5
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling block-padding v0.2.1
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling unicode_names2 v0.4.0
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling build_const v0.2.2
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling smawk v0.3.1
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling cpufeatures v0.1.5
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling lalrpop-util v0.19.6
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling volatile v0.3.0
[INFO] [stderr]    Compiling hexf-parse v0.1.0
[INFO] [stderr]    Compiling matches v0.1.9
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling puruspe v0.1.5
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling timsort v0.1.2
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling exitcode v1.1.2
[INFO] [stderr]    Compiling strum v0.21.0
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling unicode-casing v0.1.0
[INFO] [stderr]    Compiling base64 v0.13.0
[INFO] [stderr]    Compiling xml-rs v0.8.4
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling rustpython-pylib v0.1.0 (/opt/rustwide/workdir/vm/pylib-crate)
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling ahash v0.7.4
[INFO] [stderr]    Compiling instant v0.1.10
[INFO] [stderr]    Compiling unic-char-property v0.9.0
[INFO] [stderr]    Compiling unic-ucd-version v0.9.0
[INFO] [stderr]    Compiling thread_local v1.1.3
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling phf_shared v0.9.0
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling tinyvec v1.3.1
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling textwrap v0.13.4
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]    Compiling unic-emoji-char v0.9.0
[INFO] [stderr]    Compiling unic-ucd-ident v0.9.0
[INFO] [stderr]    Compiling unic-ucd-hangul v0.9.0
[INFO] [stderr]    Compiling unic-ucd-bidi v0.9.0
[INFO] [stderr]    Compiling unic-ucd-age v0.9.0
[INFO] [stderr]    Compiling unic-ucd-category v0.9.0
[INFO] [stderr]    Compiling string_cache v0.8.1
[INFO] [stderr]    Compiling ena v0.14.0
[INFO] [stderr]    Compiling unic-ucd-normal v0.9.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.19
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling dirs-sys-next v0.1.2
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling unic-normal v0.9.0
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling dirs-next v2.0.0
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling socket2 v0.4.1
[INFO] [stderr]    Compiling fd-lock v2.0.0
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling nix v0.20.1
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling which v4.2.2
[INFO] [stderr]    Compiling nix v0.22.1
[INFO] [stderr]    Compiling uname v0.1.1
[INFO] [stderr]    Compiling gethostname v0.2.1
[INFO] [stderr]    Compiling termios v0.3.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling crypto-mac v0.8.0
[INFO] [stderr]    Compiling rustpython-vm v0.1.2 (/opt/rustwide/workdir/vm)
[INFO] [stderr]    Compiling term v0.7.0
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling env_logger v0.8.4
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling dns-lookup v1.0.8
[INFO] [stderr]    Compiling md-5 v0.9.1
[INFO] [stderr]    Compiling sha2 v0.9.5
[INFO] [stderr]    Compiling sha-1 v0.9.7
[INFO] [stderr]    Compiling sha3 v0.9.1
[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-1.0.74/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C debuginfo=2 -C debug-assertions=on --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="quote"' --cfg 'feature="visit"' -C metadata=b16f3a1dbfdd9519 -C extra-filename=-b16f3a1dbfdd9519 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-14c42d2dce5f1ee7.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-7981914506c63f8e.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-dafa90c9632da752.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" "1c6126975c75b2ca5504562378e129035ccc0c4adc3613bf8c28d9194551ea9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c6126975c75b2ca5504562378e129035ccc0c4adc3613bf8c28d9194551ea9e", kill_on_drop: false }`
[INFO] [stdout] 1c6126975c75b2ca5504562378e129035ccc0c4adc3613bf8c28d9194551ea9e