[INFO] updating cached repository https://github.com/ceckenrode/lol-os
[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] 8aa1afbc8e6df04437530f3338c65a182dc85c2a
[INFO] checking ceckenrode/lol-os against master#b61e69433951e31f7bd746e22f516a48ad41623b for prs-64470-and-65389
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fceckenrode%2Flol-os" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ceckenrode/lol-os on toolchain b61e69433951e31f7bd746e22f516a48ad41623b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ceckenrode/lol-os
[INFO] finished tweaking git repo https://github.com/ceckenrode/lol-os
[INFO] tweaked toml for git repo https://github.com/ceckenrode/lol-os written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/ceckenrode/lol-os already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+b61e69433951e31f7bd746e22f516a48ad41623b" "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] 5c402ee4b5c203e9422b2cba3be757a3d4149686d304f1aed3ba82c889b9c2a4
[INFO] running `"docker" "start" "-a" "5c402ee4b5c203e9422b2cba3be757a3d4149686d304f1aed3ba82c889b9c2a4"`
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking os_bootinfo v0.2.1
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]     Checking font8x8 v0.2.4
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]     Checking array-init v0.0.4
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling skeptic v0.5.0
[INFO] [stderr]    Compiling fixedvec v0.2.3
[INFO] [stderr]     Checking bootloader v0.4.0
[INFO] [stderr]     Checking lol_os 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 `lol_os`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "5c402ee4b5c203e9422b2cba3be757a3d4149686d304f1aed3ba82c889b9c2a4"`
[INFO] running `"docker" "rm" "-f" "5c402ee4b5c203e9422b2cba3be757a3d4149686d304f1aed3ba82c889b9c2a4"`
[INFO] [stdout] 5c402ee4b5c203e9422b2cba3be757a3d4149686d304f1aed3ba82c889b9c2a4