[INFO] updating cached repository https://github.com/hardvain/dua
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7d645e48f45f11fdd9a99d6ca38cb1d816947716
[INFO] testing hardvain/dua against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhardvain%2Fdua" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hardvain/dua on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/hardvain/dua
[INFO] finished tweaking git repo https://github.com/hardvain/dua
[INFO] tweaked toml for git repo https://github.com/hardvain/dua written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/hardvain/dua already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "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=warn" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2a5a63834571363af0c7d135c9ecce6312f56d9ad428e6b7648e361894a86d4d
[INFO] running `"docker" "start" "-a" "2a5a63834571363af0c7d135c9ecce6312f56d9ad428e6b7648e361894a86d4d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling dua v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::path::Display`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::path::Display;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Receiver`, `Sender`
[INFO] [stderr]  --> src/main.rs:8:23
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::sync::mpsc::{Sender, Receiver};
[INFO] [stderr]   |                       ^^^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `std::sync::mpsc::Sender<std::result::Result<std::vec::Vec<File>, _>>` cannot be shared between threads safely
[INFO] [stderr]    --> src/main.rs:29:13
[INFO] [stderr]     |
[INFO] [stderr] 29  |             thread::spawn(|| {
[INFO] [stderr]     |             ^^^^^^^^^^^^^ `std::sync::mpsc::Sender<std::result::Result<std::vec::Vec<File>, _>>` cannot be shared between threads safely
[INFO] [stderr]     |
[INFO] [stderr]     = help: the trait `std::marker::Sync` is not implemented for `std::sync::mpsc::Sender<std::result::Result<std::vec::Vec<File>, _>>`
[INFO] [stderr]     = note: required because of the requirements on the impl of `std::marker::Send` for `&std::sync::mpsc::Sender<std::result::Result<std::vec::Vec<File>, _>>`
[INFO] [stderr]     = note: required because it appears within the type `[closure@src/main.rs:29:27: 32:14 file:&std::fs::DirEntry, tx:&std::sync::mpsc::Sender<std::result::Result<std::vec::Vec<File>, _>>]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `dua`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2a5a63834571363af0c7d135c9ecce6312f56d9ad428e6b7648e361894a86d4d"`
[INFO] running `"docker" "rm" "-f" "2a5a63834571363af0c7d135c9ecce6312f56d9ad428e6b7648e361894a86d4d"`
[INFO] [stdout] 2a5a63834571363af0c7d135c9ecce6312f56d9ad428e6b7648e361894a86d4d