[INFO] crate sync-threadpool 0.0.2 is already in cache
[INFO] testing sync-threadpool-0.0.2 against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] extracting crate sync-threadpool 0.0.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate sync-threadpool 0.0.2 on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate sync-threadpool 0.0.2
[INFO] finished tweaking crates.io crate sync-threadpool 0.0.2
[INFO] tweaked toml for crates.io crate sync-threadpool 0.0.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stdout] 4ed06823c1cd2d9b6b38758c7d12395e85a716ff4fcf11eb0ee72f28477bb6f4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "4ed06823c1cd2d9b6b38758c7d12395e85a716ff4fcf11eb0ee72f28477bb6f4"`
[INFO] [stderr]    Compiling sync-threadpool v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::boxed::FnBox`
[INFO] [stderr]   --> src/lib.rs:69:5
[INFO] [stderr]    |
[INFO] [stderr] 69 | use std::boxed::FnBox;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^ no `FnBox` in `boxed`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `sync-threadpool`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "4ed06823c1cd2d9b6b38758c7d12395e85a716ff4fcf11eb0ee72f28477bb6f4"`
[INFO] running `"docker" "rm" "-f" "4ed06823c1cd2d9b6b38758c7d12395e85a716ff4fcf11eb0ee72f28477bb6f4"`
[INFO] [stdout] 4ed06823c1cd2d9b6b38758c7d12395e85a716ff4fcf11eb0ee72f28477bb6f4