[INFO] fetching crate salmon 0.5.0...
[INFO] testing salmon-0.5.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate salmon 0.5.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate salmon 0.5.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate salmon 0.5.0
[INFO] finished tweaking crates.io crate salmon 0.5.0
[INFO] tweaked toml for crates.io crate salmon 0.5.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fdbf55873cedc9d887ec77778fa037a71bade983efd35053e1d8f519d60c26cb
[INFO] running `Command { std: "docker" "start" "-a" "fdbf55873cedc9d887ec77778fa037a71bade983efd35053e1d8f519d60c26cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdbf55873cedc9d887ec77778fa037a71bade983efd35053e1d8f519d60c26cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdbf55873cedc9d887ec77778fa037a71bade983efd35053e1d8f519d60c26cb", kill_on_drop: false }`
[INFO] [stdout] fdbf55873cedc9d887ec77778fa037a71bade983efd35053e1d8f519d60c26cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 373e1d00464762236ab8f0945ed9c9152842a839d8c01f02ead7dc6de365425a
[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" "373e1d00464762236ab8f0945ed9c9152842a839d8c01f02ead7dc6de365425a", kill_on_drop: false }`
[INFO] [stderr]    Compiling bindgen v0.55.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling mac v0.1.1
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling procedural-masquerade v0.1.7
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling nodrop v0.1.14
[INFO] [stderr]    Compiling pulldown-cmark v0.5.3
[INFO] [stderr]    Compiling thin-slice v0.1.1
[INFO] [stderr]    Compiling ego-tree v0.6.2
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling clang-sys v1.0.3
[INFO] [stderr]    Compiling dtoa-short v0.3.3
[INFO] [stderr]    Compiling line-wrap v0.1.1
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling sass-sys v0.4.21
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling cssparser v0.25.9
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling futf v0.1.4
[INFO] [stderr]    Compiling servo_arc v0.1.1
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling selectors v0.21.0
[INFO] [stderr]    Compiling cssparser-macros v0.3.6
[INFO] [stderr]    Compiling tendril v0.4.1
[INFO] [stderr] error: could not compile `synstructure`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name synstructure --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/synstructure-0.12.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="proc-macro"' -C metadata=7729536cc7b10159 -C extra-filename=-7729536cc7b10159 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-b8449736663a1660.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-4ff43fa145cc0264.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-344ae734277e132b.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-1c0accd586890c80.rmeta --cap-lints allow --cap-lints=warn` (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" "373e1d00464762236ab8f0945ed9c9152842a839d8c01f02ead7dc6de365425a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "373e1d00464762236ab8f0945ed9c9152842a839d8c01f02ead7dc6de365425a", kill_on_drop: false }`
[INFO] [stdout] 373e1d00464762236ab8f0945ed9c9152842a839d8c01f02ead7dc6de365425a