[INFO] fetching crate varcon 0.5.1...
[INFO] testing varcon-0.5.1 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate varcon 0.5.1 into /workspace/builds/worker-60/source
[INFO] validating manifest of crates.io crate varcon 0.5.1 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 varcon 0.5.1
[INFO] finished tweaking crates.io crate varcon 0.5.1
[INFO] tweaked toml for crates.io crate varcon 0.5.1 written to /workspace/builds/worker-60/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded varcon-core v2.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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] a549266db89403ae5fe14023eda54da03053dfa8faa82397f0cb4aceff1f94a9
[INFO] running `Command { std: "docker" "start" "-a" "a549266db89403ae5fe14023eda54da03053dfa8faa82397f0cb4aceff1f94a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a549266db89403ae5fe14023eda54da03053dfa8faa82397f0cb4aceff1f94a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a549266db89403ae5fe14023eda54da03053dfa8faa82397f0cb4aceff1f94a9", kill_on_drop: false }`
[INFO] [stdout] a549266db89403ae5fe14023eda54da03053dfa8faa82397f0cb4aceff1f94a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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] bf016c6a80326ca15206495d6b29d3867ed6fd5a7cc16311c1b16621cac09dd6
[INFO] running `Command { std: "docker" "start" "-a" "bf016c6a80326ca15206495d6b29d3867ed6fd5a7cc16311c1b16621cac09dd6", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling enumflags2_derive v0.7.0
[INFO] [stderr]    Compiling enumflags2 v0.7.1
[INFO] [stderr]    Compiling varcon-core v2.1.1
[INFO] [stderr]    Compiling varcon v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `varcon`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name varcon --edition=2018 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="all"' --cfg 'feature="default"' --cfg 'feature="flags"' -C metadata=cab03651d209e10b -C extra-filename=-cab03651d209e10b --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern varcon_core=/opt/rustwide/target/debug/deps/libvarcon_core-612ab65939636247.rmeta --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "bf016c6a80326ca15206495d6b29d3867ed6fd5a7cc16311c1b16621cac09dd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf016c6a80326ca15206495d6b29d3867ed6fd5a7cc16311c1b16621cac09dd6", kill_on_drop: false }`
[INFO] [stdout] bf016c6a80326ca15206495d6b29d3867ed6fd5a7cc16311c1b16621cac09dd6