[INFO] updating cached repository https://github.com/meltinglava/jpg_uncluster
[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] 663d6a660d62cc2aaead963b8ab2001585389032
[INFO] checking meltinglava/jpg_uncluster against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmeltinglava%2Fjpg_uncluster" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/meltinglava/jpg_uncluster on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/meltinglava/jpg_uncluster
[INFO] finished tweaking git repo https://github.com/meltinglava/jpg_uncluster
[INFO] tweaked toml for git repo https://github.com/meltinglava/jpg_uncluster written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/meltinglava/jpg_uncluster already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "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" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "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] 1394aa051c0ffbff5115f28a708d83ca3a0d5769dd4cc1c800a2ac2773875fbe
[INFO] running `"docker" "start" "-a" "1394aa051c0ffbff5115f28a708d83ca3a0d5769dd4cc1c800a2ac2773875fbe"`
[INFO] [stderr]     Checking hashbrown v0.1.8
[INFO] [stderr]     Checking jpg_uncluster v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0277]: cannot add `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]   --> src/main.rs:51:38
[INFO] [stderr]    |
[INFO] [stderr] 51 |                 .join(self.s.clone() + &duplicate_value)
[INFO] [stderr]    |                                      ^ no implementation for `std::string::String + &std::borrow::Cow<'_, str>`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::ops::Add<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: cannot add `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]   --> src/main.rs:51:38
[INFO] [stderr]    |
[INFO] [stderr] 51 |                 .join(self.s.clone() + &duplicate_value)
[INFO] [stderr]    |                                      ^ no implementation for `std::string::String + &std::borrow::Cow<'_, str>`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::ops::Add<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `jpg_uncluster`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `jpg_uncluster`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1394aa051c0ffbff5115f28a708d83ca3a0d5769dd4cc1c800a2ac2773875fbe"`
[INFO] running `"docker" "rm" "-f" "1394aa051c0ffbff5115f28a708d83ca3a0d5769dd4cc1c800a2ac2773875fbe"`
[INFO] [stdout] 1394aa051c0ffbff5115f28a708d83ca3a0d5769dd4cc1c800a2ac2773875fbe