[INFO] updating cached repository team-rust/mailbox
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/team-rust/mailbox
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/team-rust/mailbox" "work/ex/beta-1.37-6/sources/1.36.0/gh/team-rust/mailbox"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/team-rust/mailbox'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/team-rust/mailbox" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/team-rust/mailbox"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/team-rust/mailbox'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1080ebc5bb1e9af9033169e806b52b05718376b7
[INFO] sha for GitHub repo team-rust/mailbox: 1080ebc5bb1e9af9033169e806b52b05718376b7
[INFO] validating manifest of team-rust/mailbox on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of team-rust/mailbox on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing team-rust/mailbox
[INFO] finished frobbing team-rust/mailbox
[INFO] frobbed toml for team-rust/mailbox written to work/ex/beta-1.37-6/sources/1.36.0/gh/team-rust/mailbox/Cargo.toml
[INFO] started frobbing team-rust/mailbox
[INFO] finished frobbing team-rust/mailbox
[INFO] frobbed toml for team-rust/mailbox written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/team-rust/mailbox/Cargo.toml
[INFO] crate team-rust/mailbox already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing team-rust/mailbox against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/team-rust/mailbox:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 1d1421a3fb54e8ad0dbd0a6a57eae02bd7607b8deb516fab8e4d637ffebe3ccb
[INFO] running `"docker" "start" "-a" "1d1421a3fb54e8ad0dbd0a6a57eae02bd7607b8deb516fab8e4d637ffebe3ccb"`
[INFO] [stderr]    Compiling mailbox v0.1.0 (/opt/crater/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 0.54s
[INFO] running `"docker" "inspect" "1d1421a3fb54e8ad0dbd0a6a57eae02bd7607b8deb516fab8e4d637ffebe3ccb"`
[INFO] running `"docker" "rm" "-f" "1d1421a3fb54e8ad0dbd0a6a57eae02bd7607b8deb516fab8e4d637ffebe3ccb"`
[INFO] [stdout] 1d1421a3fb54e8ad0dbd0a6a57eae02bd7607b8deb516fab8e4d637ffebe3ccb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/team-rust/mailbox:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] a24f49e792fae3bbb2a75f91168030d03087c0af336486846c020969b7d4f372
[INFO] running `"docker" "start" "-a" "a24f49e792fae3bbb2a75f91168030d03087c0af336486846c020969b7d4f372"`
[INFO] [stderr]    Compiling mailbox v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.14s
[INFO] running `"docker" "inspect" "a24f49e792fae3bbb2a75f91168030d03087c0af336486846c020969b7d4f372"`
[INFO] running `"docker" "rm" "-f" "a24f49e792fae3bbb2a75f91168030d03087c0af336486846c020969b7d4f372"`
[INFO] [stdout] a24f49e792fae3bbb2a75f91168030d03087c0af336486846c020969b7d4f372
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/team-rust/mailbox:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] b9c2766f04cd621f6f83a20c5acbfcfbf6d0654bddc77b103922492725814a5c
[INFO] running `"docker" "start" "-a" "b9c2766f04cd621f6f83a20c5acbfcfbf6d0654bddc77b103922492725814a5c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mailbox-dd4f36522a6a860b
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test syncedmailbox::tests::test_store ... ok
[INFO] [stdout] test syncedmailbox::tests::test_fetch ... ok
[INFO] [stdout] test mailbox::tests::test_fetch ... ok
[INFO] [stdout] test mailbox::tests::test_store ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "b9c2766f04cd621f6f83a20c5acbfcfbf6d0654bddc77b103922492725814a5c"`
[INFO] running `"docker" "rm" "-f" "b9c2766f04cd621f6f83a20c5acbfcfbf6d0654bddc77b103922492725814a5c"`
[INFO] [stdout] b9c2766f04cd621f6f83a20c5acbfcfbf6d0654bddc77b103922492725814a5c