[INFO] fetching crate cursebox 0.2.8...
[INFO] checking cursebox-0.2.8 against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] extracting crate cursebox 0.2.8 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate cursebox 0.2.8 on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate cursebox 0.2.8
[INFO] finished tweaking crates.io crate cursebox 0.2.8
[INFO] tweaked toml for crates.io crate cursebox 0.2.8 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 24de34344a3fef69d061f925cc0620bfdfaace1517018960a479cfc336e12c43
[INFO] running `"docker" "start" "-a" "24de34344a3fef69d061f925cc0620bfdfaace1517018960a479cfc336e12c43"`
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling ptr v0.2.1
[INFO] [stderr]    Compiling hash-table v0.2.3
[INFO] [stderr]    Compiling containers v0.9.6
[INFO] [stderr]    Compiling i-o v0.4.4
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking idem v0.4.0
[INFO] [stderr]     Checking utf v0.1.5
[INFO] [stderr]     Checking flags v0.1.4
[INFO] [stderr]     Checking system-call v0.1.1
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking syscall v0.2.1
[INFO] [stderr]     Checking util v0.1.2
[INFO] [stderr]     Checking slot v0.2.5
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking fallible v0.1.3
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]     Checking idem v0.1.1
[INFO] [stderr] error[E0740]: unions may not contain fields that need dropping
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/slot-0.2.5/src/lib.rs:11:21
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub union Slot<T> { pub x: T }
[INFO] [stderr]    |                     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `std::mem::ManuallyDrop` can be used to wrap the type
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/slot-0.2.5/src/lib.rs:11:21
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub union Slot<T> { pub x: T }
[INFO] [stderr]    |                     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling itertools v0.5.10
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0740`.
[INFO] [stderr] error: could not compile `slot`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "24de34344a3fef69d061f925cc0620bfdfaace1517018960a479cfc336e12c43"`
[INFO] running `"docker" "rm" "-f" "24de34344a3fef69d061f925cc0620bfdfaace1517018960a479cfc336e12c43"`
[INFO] [stdout] 24de34344a3fef69d061f925cc0620bfdfaace1517018960a479cfc336e12c43