[INFO] fetching crate varcon 0.5.1...
[INFO] checking varcon-0.5.1 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate varcon 0.5.1 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate varcon 0.5.1 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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-19/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c56bb9cd5820b906b0bc726236a66fc06c0d981f6be003dc310a0581520f5fd1
[INFO] running `Command { std: "docker" "start" "-a" "c56bb9cd5820b906b0bc726236a66fc06c0d981f6be003dc310a0581520f5fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c56bb9cd5820b906b0bc726236a66fc06c0d981f6be003dc310a0581520f5fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c56bb9cd5820b906b0bc726236a66fc06c0d981f6be003dc310a0581520f5fd1", kill_on_drop: false }`
[INFO] [stdout] c56bb9cd5820b906b0bc726236a66fc06c0d981f6be003dc310a0581520f5fd1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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" "-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" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a8029b3ebae27f964668520c1d28cf2760e54fc5e76eef50147c0c7abe61a78b
[INFO] running `Command { std: "docker" "start" "-a" "a8029b3ebae27f964668520c1d28cf2760e54fc5e76eef50147c0c7abe61a78b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling enumflags2_derive v0.7.0
[INFO] [stderr]     Checking enumflags2 v0.7.1
[INFO] [stderr]     Checking varcon-core v2.1.1
[INFO] [stderr]     Checking 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 -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="all"' --cfg 'feature="default"' --cfg 'feature="flags"' -C metadata=2b1649e968756aa5 -C extra-filename=-2b1649e968756aa5 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern varcon_core=/opt/rustwide/target/debug/deps/libvarcon_core-3c54790b049b953d.rmeta --cap-lints=forbid` (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" "a8029b3ebae27f964668520c1d28cf2760e54fc5e76eef50147c0c7abe61a78b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8029b3ebae27f964668520c1d28cf2760e54fc5e76eef50147c0c7abe61a78b", kill_on_drop: false }`
[INFO] [stdout] a8029b3ebae27f964668520c1d28cf2760e54fc5e76eef50147c0c7abe61a78b