[INFO] updating cached repository https://github.com/team-rust/mailbox
[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] 1080ebc5bb1e9af9033169e806b52b05718376b7
[INFO] checking team-rust/mailbox against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fteam-rust%2Fmailbox" "/workspace/builds/worker-14/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/team-rust/mailbox 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/team-rust/mailbox
[INFO] finished tweaking git repo https://github.com/team-rust/mailbox
[INFO] tweaked toml for git repo https://github.com/team-rust/mailbox written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/team-rust/mailbox already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 44b3e2a1620959d881e9f2d267ecdde3c9d7ae3aaa627429c2f62f529c66d369
[INFO] running `"docker" "start" "-a" "44b3e2a1620959d881e9f2d267ecdde3c9d7ae3aaa627429c2f62f529c66d369"`
[INFO] [stderr]     Checking mailbox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/mailbox.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(sender: String, receiver: String, body: String) -> Message {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/mailbox.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn new() -> Mailbox {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `store`
[INFO] [stderr]   --> src/mailbox.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn store(&mut self, m: Message) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fetch`
[INFO] [stderr]   --> src/mailbox.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn fetch(&mut self) -> Option<Message> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SyncedMailbox`
[INFO] [stderr]  --> src/syncedmailbox.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct SyncedMailbox {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/syncedmailbox.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn new() -> SyncedMailbox {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `store`
[INFO] [stderr]   --> src/syncedmailbox.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn store(&self, m: mailbox::Message) -> Result<(), String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fetch`
[INFO] [stderr]   --> src/syncedmailbox.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn fetch(&self) -> Result<mailbox::Message, String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `"docker" "inspect" "44b3e2a1620959d881e9f2d267ecdde3c9d7ae3aaa627429c2f62f529c66d369"`
[INFO] running `"docker" "rm" "-f" "44b3e2a1620959d881e9f2d267ecdde3c9d7ae3aaa627429c2f62f529c66d369"`
[INFO] [stdout] 44b3e2a1620959d881e9f2d267ecdde3c9d7ae3aaa627429c2f62f529c66d369