[INFO] updating cached repository https://github.com/tiqwab/xv6-rust
[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] [stderr] From https://github.com/tiqwab/xv6-rust
[INFO] [stderr]    0a9510b..71d473e  master     -> master
[INFO] [stderr]  * [new branch]      user-shell -> user-shell
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 71d473e85f47e0cbbd66b0c6ff35a19ae587f00e
[INFO] checking tiqwab/xv6-rust against try#8a5e87609850cdd8679aada01eb0f3062f254ca8 for pr-71140
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiqwab%2Fxv6-rust" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tiqwab/xv6-rust on toolchain 8a5e87609850cdd8679aada01eb0f3062f254ca8
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/tiqwab/xv6-rust
[INFO] finished tweaking git repo https://github.com/tiqwab/xv6-rust
[INFO] tweaked toml for git repo https://github.com/tiqwab/xv6-rust written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/tiqwab/xv6-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "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] 5082e8888f702fac3260046c01fe06596f8a14824118296f722749ef075ac37e
[INFO] running `"docker" "start" "-a" "5082e8888f702fac3260046c01fe06596f8a14824118296f722749ef075ac37e"`
[INFO] [stderr]    Compiling xv6-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking linked_list_allocator v0.6.5
[INFO] [stderr] error[E0432]: unresolved import `alloc::alloc::Alloc`
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/linked_list_allocator-0.6.5/src/lib.rs:14:20
[INFO] [stderr]    |
[INFO] [stderr] 14 | use alloc::alloc::{Alloc, AllocErr, Layout};
[INFO] [stderr]    |                    ^^^^^
[INFO] [stderr]    |                    |
[INFO] [stderr]    |                    no `Alloc` in `alloc`
[INFO] [stderr]    |                    help: a similar name exists in the module: `alloc`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `linked_list_allocator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "5082e8888f702fac3260046c01fe06596f8a14824118296f722749ef075ac37e"`
[INFO] running `"docker" "rm" "-f" "5082e8888f702fac3260046c01fe06596f8a14824118296f722749ef075ac37e"`
[INFO] [stdout] 5082e8888f702fac3260046c01fe06596f8a14824118296f722749ef075ac37e