[INFO] cloning repository https://github.com/team-rust/mailbox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/team-rust/mailbox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fteam-rust%2Fmailbox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fteam-rust%2Fmailbox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1080ebc5bb1e9af9033169e806b52b05718376b7
[INFO] checking team-rust/mailbox against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fteam-rust%2Fmailbox" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/team-rust/mailbox on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-7/source/Cargo.toml
[INFO] crate git repo https://github.com/team-rust/mailbox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8d0145e0600256d4a10046f019a73fe7ec26852fe9161153d41ce0363b296e46
[INFO] running `Command { std: "docker" "start" "-a" "8d0145e0600256d4a10046f019a73fe7ec26852fe9161153d41ce0363b296e46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d0145e0600256d4a10046f019a73fe7ec26852fe9161153d41ce0363b296e46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d0145e0600256d4a10046f019a73fe7ec26852fe9161153d41ce0363b296e46", kill_on_drop: false }`
[INFO] [stdout] 8d0145e0600256d4a10046f019a73fe7ec26852fe9161153d41ce0363b296e46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ada450c8985cb30f5e8ed36efea6b455b8cedbea7a989c0b593ccac756d2a4d9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "ada450c8985cb30f5e8ed36efea6b455b8cedbea7a989c0b593ccac756d2a4d9", kill_on_drop: false }`
[INFO] [stderr]     Checking mailbox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/mailbox.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub fn new(sender: String, receiver: String, body: String) -> Message {
[INFO] [stdout]   |            ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/mailbox.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn new() -> Mailbox {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `store`
[INFO] [stdout]   --> src/mailbox.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn store(&mut self, m: Message) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `fetch`
[INFO] [stdout]   --> src/mailbox.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn fetch(&mut self) -> Option<Message> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SyncedMailbox`
[INFO] [stdout]  --> src/syncedmailbox.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct SyncedMailbox {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> src/syncedmailbox.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn new() -> SyncedMailbox {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `store`
[INFO] [stdout]   --> src/syncedmailbox.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn store(&self, m: mailbox::Message) -> Result<(), String> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `fetch`
[INFO] [stdout]   --> src/syncedmailbox.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn fetch(&self) -> Result<mailbox::Message, String> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "ada450c8985cb30f5e8ed36efea6b455b8cedbea7a989c0b593ccac756d2a4d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ada450c8985cb30f5e8ed36efea6b455b8cedbea7a989c0b593ccac756d2a4d9", kill_on_drop: false }`
[INFO] [stdout] ada450c8985cb30f5e8ed36efea6b455b8cedbea7a989c0b593ccac756d2a4d9