[INFO] crate smoltcp 0.5.0 is already in cache
[INFO] checking smoltcp-0.5.0 against nightly-2019-10-27 for pr-65897
[INFO] extracting crate smoltcp 0.5.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate smoltcp 0.5.0 on toolchain nightly-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+nightly-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate smoltcp 0.5.0
[INFO] removed 8 missing examples
[INFO] finished tweaking crates.io crate smoltcp 0.5.0
[INFO] tweaked toml for crates.io crate smoltcp 0.5.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+nightly-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+nightly-2019-10-27" "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=allow" "-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" "+nightly-2019-10-27" "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] 370c371c77df57e70af2d7403544e55fb2271d8f5c9b7cc691cbcdcdeb564e12
[INFO] running `"docker" "start" "-a" "370c371c77df57e70af2d7403544e55fb2271d8f5c9b7cc691cbcdcdeb564e12"`
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking managed v0.7.1
[INFO] [stderr]     Checking smoltcp v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]   --> src/socket/ref_.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 39 | impl<'a, T: Session + 'a> Ref<'a, T> {
[INFO] [stderr]    |      -- lifetime `'a` defined here
[INFO] [stderr] ...
[INFO] [stderr] 61 |         ref_.socket
[INFO] [stderr]    |         ^^^^^^^^^^^ returning this value requires that `*ref_.socket` is borrowed for `'a`
[INFO] [stderr] 62 |     }
[INFO] [stderr]    |     - here, drop of `ref_` needs exclusive access to `*ref_.socket`, because the type `socket::ref_::Ref<'_, T>` implements the `Drop` trait
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0713`.
[INFO] [stderr] error: could not compile `smoltcp`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]   --> src/socket/ref_.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 39 | impl<'a, T: Session + 'a> Ref<'a, T> {
[INFO] [stderr]    |      -- lifetime `'a` defined here
[INFO] [stderr] ...
[INFO] [stderr] 61 |         ref_.socket
[INFO] [stderr]    |         ^^^^^^^^^^^ returning this value requires that `*ref_.socket` is borrowed for `'a`
[INFO] [stderr] 62 |     }
[INFO] [stderr]    |     - here, drop of `ref_` needs exclusive access to `*ref_.socket`, because the type `socket::ref_::Ref<'_, T>` implements the `Drop` trait
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0713`.
[INFO] [stderr] error: could not compile `smoltcp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "370c371c77df57e70af2d7403544e55fb2271d8f5c9b7cc691cbcdcdeb564e12"`
[INFO] running `"docker" "rm" "-f" "370c371c77df57e70af2d7403544e55fb2271d8f5c9b7cc691cbcdcdeb564e12"`
[INFO] [stdout] 370c371c77df57e70af2d7403544e55fb2271d8f5c9b7cc691cbcdcdeb564e12