[INFO] cloning repository https://github.com/IgrauBezRuk/kos
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/IgrauBezRuk/kos" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIgrauBezRuk%2Fkos"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIgrauBezRuk%2Fkos'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 62841e412eebb8ae17d515d86ed70236965a1d03
[INFO] checking IgrauBezRuk/kos against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIgrauBezRuk%2Fkos" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/IgrauBezRuk/kos on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/IgrauBezRuk/kos
[INFO] finished tweaking git repo https://github.com/IgrauBezRuk/kos
[INFO] tweaked toml for git repo https://github.com/IgrauBezRuk/kos written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/IgrauBezRuk/kos already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: unused manifest key: target.cfg(target_os = "linux").rustflags
[INFO] [stderr] warning: unused manifest key: target.cfg(target_os = "macos").rustflags
[INFO] [stderr] warning: unused manifest key: target.cfg(target_os = "windows").rustflags
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] 805a9ce73a9c939092eab31a3c1e0480660c3e27ca0129e61ca9a85a3756c482
[INFO] running `"docker" "start" "-a" "805a9ce73a9c939092eab31a3c1e0480660c3e27ca0129e61ca9a85a3756c482"`
[INFO] [stderr] warning: unused manifest key: target.cfg(target_os = "linux").rustflags
[INFO] [stderr] warning: unused manifest key: target.cfg(target_os = "macos").rustflags
[INFO] [stderr] warning: unused manifest key: target.cfg(target_os = "windows").rustflags
[INFO] [stderr]     Checking kos v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0152]: duplicate lang item found: `panic_impl`.
[INFO] [stderr]  --> src/main.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | / fn panic(_info: &PanicInfo) -> ! {
[INFO] [stderr] 8 | |     loop {}
[INFO] [stderr] 9 | | }
[INFO] [stderr]   | |_^
[INFO] [stderr]   |
[INFO] [stderr]   = note: first defined in crate `std` (which `test` depends on).
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0152`.
[INFO] [stderr] error: could not compile `kos`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "805a9ce73a9c939092eab31a3c1e0480660c3e27ca0129e61ca9a85a3756c482"`
[INFO] running `"docker" "rm" "-f" "805a9ce73a9c939092eab31a3c1e0480660c3e27ca0129e61ca9a85a3756c482"`
[INFO] [stdout] 805a9ce73a9c939092eab31a3c1e0480660c3e27ca0129e61ca9a85a3756c482